The product structure of mobile power is relatively simple, mainly composed of three parts: storage medium, circuit board and shell. Among them, there are two types of storage media: polymer batteries and lithium batteries. At present, most mobile power supplies use lithium batteries, and among them, 18650 batteries dominate. The output voltage of a single 18650 cell is between 2.7-4.2V and the capacity is 2600m Ah. In order to increase the storage capacity of the mobile power supply, the method of connecting multiple battery cells in parallel is usually used, so the nominal capacity of the mobile power supply is generally a multiple of 2600mAh
Fingerprint door lock is an improved lock which is different from the traditional mechanical lock, and is more intelligent and simple in terms of user security, identification and management. Intelligent door lock is the executive part of door lock in access control system. Intelligent lock is different from traditional mechanical lock, which is a compound lock with security, convenience and advanced technology. Magnetic card and RADIO frequency card (non-contact type, high safety, plastic material, convenient to carry and low price) Mature technologies that use non-mechanical keys as user ID identifiers, such as: Fingerprint lock, iris identification access control (biometrics, high security, no loss and damage; But not easy to configure, high cost) TM card (contact class, high security, stainless steel material, very convenient to carry, low price) It is widely used in the following places: Banks, government departments (focusing on safety), hotels, school dormitories, residential communities, villas, hotels (focusing on convenient management).
Fashionable young people will have sunglasses of various colors. They look good, but they are not suitable for driving. For example, pink and purple lenses will change the color and spectrum. In fact, it is best to use gray lenses for sunglasses, because it does not change the basic color spectrum. The second is dark green. Brown and yellow lenses can improve brightness and are more suitable for foggy and dusty environments.
Myth 2: Don't wear myopia glasses
Some drivers are slightly myopic, usually driving without wearing glasses no problem. But when you put on sunglasses, the problem is that your eyes get tired more easily and your eyesight deteriorates, just as it does when you drive at night. Therefore, slightly short-sighted drivers, usually no problem driving, if you want to wear sunglasses, must be equipped with myopia lens.
Misunderstanding 3: The darker the color, the better. Many people assume that the darker the color, the better the UV protection function. In fact, the function of sunglasses to filter ultraviolet rays is only related to the coated film, and the darker the better. Because the sunglasses lens will delay the time when the optic nerve transmits the signal, resulting in distortion of the speed perception, so that the driver wearing the sunglasses makes a wrong judgment. According to a survey of optodynamic glasses, when a car or motorcycle is moving at a speed of 80 km/h, dark-colored sunglasses will extend the driver’s response to the situation by 100 milliseconds, thereby increasing the sudden braking interval of 2.2 meters.
Misunderstanding 4: Polarized lenses are most suitable. Many drivers like to wear polarized lenses. Indeed, polarized lenses can reduce glare, eliminate glare, and make the line of sight natural and soft. But in fact, polarized lenses are more suitable for large-area reflective environments such as fishing and skiing. Sometimes when facing dark scenes such as tunnels, the polarizer is easy to make people suddenly black. In addition, the polarizer will dilute the color of the LCD screen and LED traffic lights. Therefore, when choosing a polarizer, it is best to choose a good quality optical lens, and when going through a tunnel, it is best to take off the glasses in advance and blink more.
Motorcycle glasses choose an integrated polarizer, so that you can see the surrounding things to the maximum, and the polarization function can filter stray light interference.
The lens has three functions: anti-glare, rear side light and glare. Good polarized driving glasses use PC lenses, which are more wear-resistant and tougher than resin lenses, and are not easily broken or deformed.
Spectral selection and anti-glare: The color of the lens designed by spectral analysis can filter out harmful purple-blue glare, and it can significantly increase the brightness in cloudy, rainy and foggy days. It can prevent glare and snow blindness in snowy weather.
Nearly 100% protection against UVA and UVB ultraviolet rays. In short, the polarized driving glasses have anti-glare treatment on the entire lens, anti-glare treatment on the upper side of the headlight, and anti-reflection treatment on the inner side of the upper end, with three functions: anti-headlight glare, rear side light, and glare. When you drive, you can see clearly, see far, no reflections, no glare. The frame materials are mostly metal alloys.
The input and output voltages must first be adjusted. Direct 12V access to the mobile phone, will directly cause damage to some of the mobile phone hardware.
Today's car chargers come with multiple safety features. Generally built-in intelligent identification chip, according to different devices, will brake adjust the output current. Overvoltage, overtemperature, overload, short circuit and other protective measures. Intelligent control chip multiple protection
Short circuit protection, overcharge protection, temperature protection, interference protection
Compatible with digital equipment: compatible with mobile phone, tablet, Mp3, recorder, camera, audio, PSP and other equipment charging.
It feels like a very high texture charger. It's well made. It's not a cheap plastic case. Charging speed is relatively fast, a variety of devices can be used, cost-effective.
In the category of automotive electronics, in addition to the dashcam, intelligent rearview mirror, and the product of traffic monitoring and shooting to prevent racketeer party, there is another kind of product that is specially produced for the power supply of the equipment on the car, which is the car charger. With the upgrade of wireless network, there are more and more mobile devices. The network is upgraded from 4G to 5G, which makes the network more and more smooth. Mobile devices such as smart phones transmit more data, but battery life also becomes a problem for mobile devices. Therefore, it is ideal to be able to charge anywhere, with a charger in the bag and an on-board charger in the car, so as to achieve seamless connectivity everywhere. You no longer have to worry about the battery life of your mobile device in the car.
For Micro-B data cables, they are all USB 2.0 standard, with 4 cores inside. There is no difference except the wire diameter. You can use it instead. The voltage drop of the core wire diameter will be higher. Type-C cables are more complicated. There are USB 2.0 standard (the charging cable of many mobile phones is often this), there is USB 2.0 standard but also supports fast charging (the internal CC cable is connected), and it supports USB 3.1 Full-featured line. But no matter which one, it will support 5V charging at least, current 500mA, 1A, 2.1A, etc. In other words, the worst case is that fast charging may not be supported. In addition, the thickness of the usb charging cable does not represent the thickness of its core conductor. This should be noted.
In theory, the USB charging cable only uses two wires for power supply (VBus) and ground (GND), and does not involve data transmission, so basically the USB charging cables are similar. For better wires, there are more copper wires in the core, but for lesser wires, there are very few copper wires in the core, even I have seen only one or two wires. If the quality of the core is poor, it will definitely affect the charging, especially now that the output current is more than 2A, the resistance of the poor quality line will be larger, and there is a risk of overheating and fire, and the poor line charging speed It will be slower.
The role of tripod is not negligible for both amateur and professional users, its main role is to stabilize the camera to achieve some kind of photographic effect. The most common is the use of a tripod in long exposures. If the user wants to take pictures of night scenes or with surge tracks, the exposure time needs to be extended. At this time, the digital camera cannot shake, so the tripod is needed to help. Also has a lot of the choice of the tripod, buy tripod main shooting Angle frame for a few will actually provide a stable state of shooting, but there are a lot of things can lead to a tripod to produce instability, for example itself is using a lighter weight tripod or so-called portable tripod, an imbalance in the open Angle bracket or not on the button, or when used in formal excessively long axis of the middle of the pole, etc., will make the horn frame shook.
A tripod is a support frame used to stabilize a camera for certain photographic effects. The positioning of the tripod is very important. Tripod can be divided into wood, high strength plastic material, aluminum alloy material, steel material, volcanic stone, carbon fiber and so on. Generally, people tend to ignore the importance of tripod when using digital camera to take photos. In fact, photo shooting often cannot do without the help of tripod, such as star orbit shooting, water shooting, night shooting, macro shooting and other aspects. The tripod is important for both amateur and professional users. Its main function is to stabilize the camera to achieve a certain photographic effect. The most common is the use of a tripod for long exposures. Users need a longer exposure time if they want to shoot night scenes or images with surge tracks. At this time, they need the help of a tripod to keep the camera from shaking. Therefore, the first factor in choosing a tripod is stability.
