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Earphones are a pair of conversion units, which accept electrical signals from a media player or receiver, and convert them into audible sound waves using speakers close to the ears. The headset is generally detachable from the media player and connected with a plug. The advantage is that it can listen to the sound alone without affecting others; it can also isolate the sound of the surrounding environment, which is very helpful for people who use it in noisy environments such as recording studios, bars, travel, and sports. Earphones were originally used on phones and radios, but with the popularity of portable electronic devices, earphones are mostly used in mobile phones, walkmans, radios, portable video games and digital audio players.

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Haylou GT1 Touch Control / Noise Canceling / Comfortable Wearing / Wireless Bluetooth 5.0 Earbud from

Main Features:
• Frequency response range 20-20000Hz
• Impedance 32
• Sensitivity 110dB
• Bluetooth version 5.0
• Multiple touch, DSP noise reduction, IPX5 waterproof
• Speaker: 7.2mm moving coil unit
• Headphones 3.5 hours battery life, charging box 12 hours battery life, charging time about 1.5h, standby 120h
• Battery capacity earphone 43mAh, charging bin 310mAh
Brand: Haylou
Earphones type: Hands-free
Materials: ABS
Mainly Compatible with: HTC, HTC One M9, iPhone, iPhone 5/5S, iPhone 6, iPhone 6 Plus, iPhone 6S, LG, Motorola, Nokia, SAMSUNG
Functions: Phone call answering,Song switch,Support music
Package weight: 0.128 kg
Product size (L x W x H): 6.20 x 4.00 x 2.72 cm / 2.44 x 1.57 x 1.07 inches
Package size (L x W x H): 15.00 x 10.00 x 5.00 cm / 5.91 x 3.94 x 1.97 inches
Package Contents: 2 x Earphone, 1 x Charging Bin, 1 x Chinese / English Manual, 1 x Data Cable, 3 x Pair of Ear Cap

The printer is one of the output devices of the computer, which is used to print the computer processing results on the relevant media. There are three indicators to measure the quality of a printer: printing resolution, printing speed and noise. There are many types of printers. According to whether the printing element strikes the paper or not, there are impact printers and non-impact printers. According to the structure of printing characters, it can be divided into full-form printers and dot matrix printers. According to the way that a line of characters is formed on paper, it is divided into a serial printer and a line printer. According to the technology used, it can be divided into cylindrical, spherical, inkjet, thermal, laser, electrostatic, magnetic, LED and other printers.

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Creality3D Ender-5 3D Printer Junior Industrial 220 x 220 x 300mm

Main Features
● The printing is more stable: the double Y-axis motion control system drives the high-quality stable output of the two-side synchronous belt, effectively avoiding the shock caused by printing.
● Built-in motherboard power supply: According to the circuit design, device specifications and heat dissipation, the wires are concentrated in the machine for independent control.
● Design: The body is simple and generous, enhance the creative space of printing.
● Power failure continued: Automatically store the print record after power off, continue printing after power-on, and improve the model print success rate.
● Broken material detection: When the consumables are exhausted, disconnected, or other abnormal conditions occur, the printing will be automatically suspended, and printing will continue after the consumables are accessed.
● Easy leveling method: The large hand-turning nut is ergonomically designed, the leveling speed is fast, and it is free from time-consuming and labor-intensive problems.
● Industrial grade circuit board: After high load safety inspection, the performance is stable, and there is no pressure for 200 hours of continuous operation.
Brand Name: Creality3D
Type: DIY
Model: Ender-5
Frame material: Aluminium Extrusion
Nozzle quantity: Single
Nozzle diameter: 0.4mm
Nozzle temperature: 0 to 260 degree
Product forming size: 220 x 220 x 300mm
Layer thickness: 0.1-0.4mm
Memory card offline print: SD card
Print speed: 180mm/s
Platform temperature: 0 to 110 degree
Supporting material: ABS, PLA, TPU, Wood
Material diameter: 1.75mm
Language: Chinese,English
File format: AMF,STL
Model supporting function: Yes
Host computer software: Repetier-Host,Simplify3D
Packing Type: unassembled packing
Connector Type: SD card
Package weight: 14.285 kg
Product size: 55.20 x 48.50 x 51.00 cm / 21.73 x 19.09 x 20.08 inches
Package size: 61.00 x 57.00 x 34.50 cm / 24.02 x 22.44 x 13.58 inches
Packing Contents: 1 x DIY 3D Printer

The car monitor is an important part of the car audio and video system. Its function is equivalent to the color TV in the home theater. It can receive car audio and video signals and play them back on the display. Used in sports.

However, due to the particularity of the vehicle, the car display often has other functions besides broadcasting programs. For example, after connecting a car camera, it can automatically display the scene behind the car when reversing, which is convenient for reversing; in addition, it may also have other additional functions such as small speakers and small lights. Since the space inside the car is relatively small, and the environment that the car is in is more changing during the movement, the on-board display device may also have functions such as automatic backlight adjustment, anti-glare, and automatic angle adjustment to adapt to the particularity of the car.

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Intelligent HUD Car Head Up Display Bluetooth 4.0 Version OBD Driving Data

Main Features:
● Suspension virtual instrument panel, driving without bowing
● Voice manipulation
● OBD driving data
● LCD wide temperature screen
● No flicker 12-level automatic light perception
● Three modes: automatic light perception, phone button manual control, APP control
● Fanless heat dissipation design, safe and worry-free

Parameters:
- Working voltage: DC 12V
- Working current: 0.5A
- Standby current: 0.3MA
- Power supply mode: OBD power supply
- Working temperature: -20 - 80 Deg. C
- Magnification: 5 - 6 times
- Imaging size: 100X200MM
- Imaging distance (offscreen): 1.1M
- Communication module parameters: Bluetooth 4.0 BLE communication modePackage weight: 0.852 kg
Product Size(L x W x H): 14.50 x 8.70 x 3.20 cm / 5.71 x 3.43 x 1.26 inches
Package Size(L x W x H): 18.00 x 16.00 x 9.00 cm / 7.09 x 6.3 x 3.54

The wireless router is a router with wireless coverage function for users to surf the Internet.
With the gradual popularization of broadband networks, broadband routers have been used more and more widely, and the broadband routing market has been derived and developed. There are also many types of router products, making most consumers who want to buy routers but lack basic technology no choice. .
Easy to use:
When buying a router, you must pay attention to the router's related instructions, or ask the merchant whether to provide web interface management, otherwise there may be difficulties in configuration or maintenance for home users.
Number of LAN ports:
The LAN port is the local area network port. Since the number of home computers cannot be too much, the number of LAN ports can meet the demand. Too many LAN ports are just a waste for the family and will increase unnecessary expenses.
Number of WAN ports:
The WAN port is a broadband network port, which is a wide area network interface used to connect to the Internet. Usually in the home broadband network, the WAN port is connected such as a residential broadband LAN interface or ADSLMondem and so on. The general home broadband users do not have very high network requirements, so generally only one WAN port of the router is enough, and it is not necessary to use a multi-WAN port router for excessive pursuit of network bandwidth.
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Xiaomi AC2100 Mi Router 2.4GHz 5GHz WiFi 128Mb ROM 128Mb

In terms of motorcycle materials, carbon fiber is the best, light and safe, but the price is also expensive, so relatively speaking, glass fiber is a cost-effective choice, while others are average.

If you only wear a helmet for daily commuting and the speed is not fast, the helmet should be as light as possible. If it is too heavy, the neck will be very sore.

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Motorcycle Safety Safe Retro Open Face Detachable Helmet

Helmet lenses can be roughly divided into transparent lenses and non-transparent lenses. Non-transparent lenses are available in black, brown, and electroplated colors. The specific choice of lenses depends mainly on personal needs. If you want to be cool and handsome, you can choose non-transparent lenses, but using non-transparent lenses at night will hinder your vision and affect riding. Of course, we can choose a helmet with dual lenses, or we can prepare a few more original lenses, and replace the lenses as needed. Many helmets have lens disassembly and assembly functions.

Main Features:
-Open face design, you will have a better view.
-High quality lightweight ABS shell, no deformation, impact and scratch resistance.
-High density buffer layer with energy absorbing structure can effectively protect your head.
-High quality and retro sponge lining, you won't feel fatigue when driving a long distance.
Gender: Unisex
Helmet Material: ABS
Helmet Style: Open Face
Package weight: 1.241 kg
Package Size(L x W x H): 32.50 x 26.00 x 25.00 cm / 12.8 x 10.24 x 9.84 inches
Package Contents: 1 x Motorcycle Helmet

The batteries used in digital cameras are generally two 1.5V cylindrical batteries or a single square 3.7V lithium ion battery. Old-fashioned digital cameras generally use AA or AA batteries, and users who do not use digital cameras often use alkaline batteries of better quality. Because alkaline batteries are both cheaper and more powerful than nickel-metal hydride batteries, even if the batteries run out during use, they can be easily purchased in small shops everywhere. Nowadays, most digital camera batteries are lithium-ion batteries. Lithium-ion battery is easy to use, no need to worry about buying a battery; it is convenient to charge when traveling, and it can use the same universal charger as the mobile phone. With the development of technology, the capacity of lithium-ion batteries will be higher than before.

ThiEYE Dual Battery Charger with Two 1100mAh Batteries for T5e / T5 Action Camera

Details
Description
The dual battery charger with two 3.7V 1100mAh backup Li-ion batteries forms a perfect combination for your ThiEYE T5e / T5 action camera. The dual battery charger can quickly charge two Li-ion batteries simultaneously. They will keep your action camera away from powering off.

Main Features:
● Cell type: Li-ion
● Capacity: 1100mAh
● Voltage: 3.7V
● Quickly charges two Li-on batteries simultaneously
● The smart LED lights will indicate red in the process of charging and turn green when the batteries are fully charged.
Brand: ThiEYE
Accessory type: Battery,Battery Charger
Compatible with: ThiEYE T5, ThiEYE T5e
Package size (L x W x H): 19.30 x 14.00 x 5.00 cm / 7.6 x 5.51 x 1.97 inches
Package weight: 0.141 kg
Product size (L x W x H): 6.00 x 4.40 x 1.70 cm / 2.36 x 1.73 x 0.67 inches
Product weight: 0.112 kg
Package Contents: 1 x Battery Charger, 2 x Battery

The Bluetooth headset is the application of Bluetooth technology to the hands-free headset, allowing users to avoid the annoying wires and make calls in various ways. Since the advent of Bluetooth headsets, it has been a good tool for mobile business people to improve efficiency.

Recommend Bluetooth headset:

QCY T2C / T1S TWS Bluetooth Earphones Binaural Wireless Stereo Earbuds with Mic and Charging Dock

Bluetooth headset specifications: HSP, HFP, A2DP

As for the purchase of Bluetooth headsets, because there are many brands of mobile phones and headsets, the most troublesome issue for consumers is the compatibility between mobile phones and Bluetooth headsets. The manufacturer pointed out that Bluetooth headsets have three specifications: HeadsetPro-file (HSP), HandfreeProfile (HFP) and A2DP. HSP provides the basic functions required for communication between mobile phones (mobile phones) and headsets. HandfreeProfile (HFP) adds some extended functions on the basis of HeadsetPro-file (HSP). Originally, it was only used to control mobile phones by fixing the car hands-free device from the Bluetooth headset. A2DP (Advanced Audio Transmission Specification)-allows the transmission of stereo audio signals. (Compared to the mono encryption used for HSP and HFP, the quality is much better). Decide the compatibility of the headset and the mobile phone.
Among them, the Bluetooth headset of the HFP format supports more complete functions of the mobile phone. Consumers can operate the hands-free options such as redial, call retention, and call rejection on the headset at the same time. Take the Bluetooth headsets launched by several major manufacturers such as Nokia, Motorola, Sony Ericsson, and QCY as examples. Almost all of them support the HFP format. Pimect supports both HFP and HSP. Consumers should pay special attention when purchasing.
In addition, when consumers purchase Bluetooth products, they often encounter the problem of how to choose the Bluetooth technology version. Different Bluetooth versions are related to the quality of the received signal. The new version emphasizes the ability to overcome noise interference, and all the latest versions of Bluetooth are designed to be downward. Compatible with all previous versions. Devices of version 2.0 and version 1.1 can also be connected freely. 3.0 is relatively compatible and is a relatively mature technology. Bluetooth 4.0 is also compatible with high versions and low versions, and battery life is also due to technical tips. Increase, consumers should weigh price and demand when purchasing.

Although we often say that you should buy some of the best equipment you can afford, we also know that not every knight is well-off and can have this budget, so how to buy beautiful and practical equipment at a lower cost Gloves without breaking their own budget limits. This should also be the information many people want to know. After all, there are many riders who may have spent all of their budget on buying a new motorcycle, but they have no extra money to spend. Buying equipment, but besides your helmet, the other important equipment that you should buy first is the knight's gloves, because when you fall, you will stretch out your hands to support it, which is a natural instinct of human beings.

Motorcycle gloves can be roughly divided into two types according to their length: long gloves and short gloves. The length of the gloves is not only the difference in appearance, but also for different wearing needs: long gloves can provide better coverage and protection, but are less flexible and difficult to put on and take off; short gloves make up for this situation and have better It is flexible and easy to put on and take off, but its protection is relatively lower than that of long gloves. Therefore, among the following different types of gloves, according to the characteristics of the length of the gloves, they have different appearances.

PRO-BIKER CE-02 motorcycle full finger protective racing gloves
The main features are due to its lightweight structure and long service life. 1. Palm: Microfiber 2. Back of the hand: Ottoman fabric 3. Rubber patch category: Gloves Activities: Motocross racing, cycling, skiing, skating, fishing, climbing and other outdoor sports. Gender: Neutral Design: Full-finger Function: Breathable, wear-resistant, non-slip, protective
Accessory type: motorcycle gloves
Gender: General
Function: Breathable
Package weight: 0.126 kg
Product size (length x width x height): 25.00 x 8.00 x 1.20 cm / 9.84 x 3.15 x 0.47 inches
Packing size (length x width x height): 26.00 x 10.00 x 2.50 cm / 10.24 x 3.94 x 0.98 inches
Package contents: 1 x pair of motorcycle gloves

|Battery capacity≠actual capacity

The big red box "20000mAh" is the battery capacity of Xiaomi, which can be understood as the theoretical capacity and battery cell capacity. During the power conversion process, energy consumption will occur, and the final effective power must not reach 20000mAh.
The battery capacity is 20000mAh. Why is the actual output capacity different by several thousand mAh? Take the 18650 battery cell as an example. The battery cell voltage is usually 3.7V, but the actual voltage when charging the mobile phone is 5V. According to the power bank conversion efficiency of 100%, the theoretical capacity converted to the output is 20000mAh×3.7/5 =14800mAh. So if you claim a 2w mAh power bank, the actual output capacity is about 14800, which is very good.
In order to compare the actual output capacity more fairly, we all use the conditions of 5V and 1A to test the discharge capacity, and it turns out that some power banks do not even reach 10,000.

main feature

-Ultra-large capacity 20000mAh portable power bank
-Two-way fast charging, whether it is charging or discharging, is more effective
-Support low current discharge, suitable for Bluetooth headsets and Xiaomi bracelets
-Made of high temperature resistant ABS material, round edge design
-LED indicator to show you power status
-Support simultaneous charging and discharging
-Fashionable design, compact size
-Built-in multiple protection
Brand: Xiaomi
Type: Standby power bank
Capacity range:> 10000mAh
Capacity (mAh): 20000mAh
Connection type: micro USB, two USB output ports
Battery type: lithium polymer battery
color: White
Material: ABS
Input: 5V / 2A, 9V / 2A, 12V / 1.5A
Output: 5.1V / 2.4A, 9V / 2A, 12V / 1.5A, maximum 18W
Package weight: 0.430 kg
Product size (length x width x height): 13.55 x 6.76 x 2.39 cm / 5.33 x 2.66 x 0.94 inches
Packing size (length x width x height): 17.00 x 9.50 x 3.50 cm / 6.69 x 3.74 x 1.38 inches
Package contents: 1 x mobile power supply, 1 x USB cable

Original Xiaomi 20000mAh mobile power bank 2 two-way fast charging dual USB output

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What is the difference between cheap and expensive power banks with the same nominal capacity?

1. In terms of the production and manufacturing process of the battery cells of the power bank, the cheap power bank battery cells have poor quality and low cost, and the more expensive power bank battery cells have high costs;
2. The peripheral control chip needs to be authorized by a fast charging agreement such as Apple Qualcomm, and the price will naturally be high;
3. The design of appearance and service life will also cause price differences;Related Products

Tire pressure gauges come in countless shapes and sizes, but they all boil down to several basic types. Dial, numbers,. It may look different meters and display different results, but they all use the same.
The first and most common measure is the stick type, also known as the pen type. It consists of a metal or plastic shell, a pocket clip and a deep sleeve chuck, which is usually used on the other side for pressure relief bumps.
The second type of pressure gauge is the dial type. It contains a protective cover around the background pressure scale dial indicator on the same dial. An air chuck or a piece of hose is connected to the dial. These meters are easier to read, but more expensive.
The third type is the digital tire pressure gauge. It consists of some necessary electronic products around a protective casing, in the form of digital readings read by the driver. An air clamp is connected to a rigid or section of hose sleeve. These meters are the easiest to use, they have a direct LCD reading, and some even talk! The electronic components used in these meters are called strain gauges. The air from the tire enters the pressure gauge in the body and it pushes the strain gauge. The resulting bending strain gauge changes its resistance value. This resistance change is input to the microprocessor and converted into a binary signal for driving LCD readings. In all shapes and sizes, these meters are very accurate and very durable.