Consumer Electronics

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.
Recommended Products:

Xiaomi AC2100 Mi Router 2.4GHz 5GHz WiFi 128Mb ROM 128Mb

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.

|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

Related Products:Teclast A10 10000mAh Power Bank High-density Dual USB

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

The camera flash is mostly used for instant lighting in low-light situations, and it is also used in brightly-lit situations to partially fill light in the subject.

It can emit strong light in a short period of time, and it is a photographic accessory for photosensitivity. It is mostly used for instantaneous lighting in low-light situations, and also used in brightly-lit situations to partially fill light in the subject. Small size, safe to use, easy to carry and stable performance.

After the flash is fully charged, the flash sync contact on the camera turns on the flash circuit. During the flash firing period, the light emitted from the flash illuminates the subject, reflects off the subject and enters the camera (for exposure) and the flash metering element. This photometric element quickly converts the light energy into an electric signal and inputs it to the integrating circuit, and then the integrating circuit outputs an electric signal proportional to the amount of flash light; when the amount of flash light reaches the requirement of appropriate exposure, the integral circuit’s The output of the electrical signal causes the control circuit to trigger the flash stop circuit, thereby extinguishing the flashlight.

The mobile phone battery is an energy storage tool that provides power to the mobile phone. It consists of three parts: a battery cell, a protection circuit and a casing. The mobile phone battery generally uses a lithium battery and a nickel-metal hydride battery. For the "activation" of the lithium battery, there are many opinions Yes: The charging time must be more than 12 hours, and full charge and discharge are repeated three times to activate the battery. This statement of "the first three charges must be charged for more than 12 hours" is for rechargeable batteries in the 1990s. The nickel-cadmium batteries at that time had a memory effect and needed to be fully charged to ensure battery capacity. The mobile phone uses a lithium-ion battery, which has no memory effect. Generally, it can be fully charged in 2-3 hours, which is enough. If the first three charging and discharging of the new battery can really reach 12 hours or more, it will cause great damage to the battery, and may cause the battery to swell or even burn. Fortunately, both the mobile phone and the charger have protection circuits. When it is fully charged, it will automatically power off, and it will not continue to charge when plugged into the charger. However, it is better to unplug the charger at this time to prevent the charger's protection circuit from overcharging, causing serious damage to the battery materials and affecting the battery's capacity and life.

The car horn generates sound through the vibration of the metal diaphragm. The car horn is composed of iron core, electromagnetic coil, contact, armature, diaphragm, etc. When the driver presses the horn switch, current flows through the coil through the contacts, and the coil generates magnetic force to attract the armature, thereby forcing the diaphragm to move. The armature moves to open the contacts, the current is interrupted, and the magnetic force of the coil disappears. The diaphragm is elastic and spring. Under this action, it returns to the original position together with the armature, the contact closure circuit is connected again, the current flows through the coil through the contact to generate magnetic force, and the above action is repeated. In this way, the diaphragm keeps vibrating and produces sound. The sound board is rigidly connected to the diaphragm, which can make the vibration stable and make the sound more pleasing (ie the principle of electromagnet)

According to the sound power, car horns are divided into two types: air horn and electric horn; according to their appearance, they are divided into three types: cylindrical, spiral and basin; according to the sound frequency, they are divided into two types: tweeter and woofer.
The horn is the audio signal device of the car. In the driving process of the car, the driver sends out the necessary audio signals according to needs and regulations to warn pedestrians and attract other vehicles to ensure traffic safety. At the same time, it is also used for urging and transmitting signals.

Motorcycle gloves are a kind of sports gloves. As the name suggests, they are mainly used for driving motorcycle gloves, especially those used by motorcycle racers. Motorcycle gloves are exquisite in materials, complex in style, and highly functional in resistance to friction and impact. Motorcycle gloves are generally made of genuine leather or high imitation leather, with high-quality foam materials that resist friction and impact at the joints, and carbon fiber protective parts on the back of the hand if necessary. Motorcycle gloves, like other sports gloves, are products of a labor-intensive industry. Due to their complex shapes and functions, they require many processes to complete.

Car GPS navigation, navigator is a car driving assistance device that can help users accurately locate their current location, calculate the itinerary according to the established destination, and guide the user to the destination through map display and voice prompts. The current market sales are very broad, and the general civilian navigation GPS is often mentioned by everyone. Such GPS is mainly used for car positioning and navigation. At present, more and more developed roads and intricate viaducts make it increasingly difficult for drivers to distinguish the road. Navigating the car GPS really brings great convenience to the driver!