Why is wireless charging not attached to the transmitter and can not be further opened? This may be a balance between distance and charging efficiency under existing technical conditions. If it is far away, it may affect charging efficiency or not electricity. It may be one reason why wireless charging technology is not popularized at present. Now it is a gimmick that is more than practical, but it is believed that with the development of technology. Wireless charging will certainly be popular.

First of all, we need to know that wireless charger for iPhone is carried out in the form of Qi standard, using the principle of electromagnetic induction. The transmission side (charging pile) generates a magnetic field through the current flowing. The Qi module of the mobile phone (equivalent to the receiving end) transforms the magnetic field into electric current through electromagnetic induction.

The problem is, as the magnetic field gets farther and farther away from the field, the magnetic induction intensity will gradually decrease (or more and more weakly), so the distance will cause the magnetic field to be discounted and the charging rate will be reduced.

So it's the right mobile phone to charge the mobile phone, otherwise, you might be slow to charge or even be able to recharge it. Let's look forward to a new generation of wireless charging. After all, the current wireless charging technology is not perfect.

Because of the current technical constraints, the wireless charger is still able to be charged on the emitter. If it is too far away, it can not be charged. At present, the wireless charging is better. It should be apple, it can charge multiple devices at the same time and can display the charging status of other devices through the mobile phone, but it is expensive. When you charge and play with the mobile phone, you know, I would be more convenient to use the charging line.

At present, the mobile phone market or the wireless charging market is not too mature, it is not as wide as wireless networks, and the electromagnetic wave of the wireless charging device attenuates as far as the distance is. So even though some phones support wireless charging, there is still a data line charging port.

If we want to recharge some distance, we can do it. It's OK to reach 3 meters now, but the other problem is that the volume of the charger is increasing, which is contrary to the convenience and portability of our design.

Another solution is to use the more electric current to produce a stronger electromagnetic field for long distance transmission, which is more unsuitable. Our community will worry about the radiation problem because of a remote transformer, let alone a high-power radiator around you.

So, I think these two points are enough to explain why wireless charging cannot be further opened.

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The road condition is important for drivers, such as road construction. Installing a GPS may convenient to driving in a right direction. So next, i will share with you how to select a suitable navigator.

Clear screen

The navigator is to provide road condition for drivers. Therefore, the screen must be clear and have a good reflection. Even under the sun, it also presents a clear image.

Size

I prefer to the small size. Because the large size will occupy large space and affect the driving vision. And it is dangerous to see the map while driving.

Speaker

In fact, for security, it is suggested not to see the map while driving. You’d better to choose a car DVR camera with speaker.

Timely updated

Now with the development of the urban, if the map isn’t updated timely, it is very likely to go the wrong place. Therefore, it is recommended to choose a dash cam that can automatically updates timely. Besides, it also orders the messages, such as real-time road conditions, traffic conditions, surrounding hotels, rest places and so on.

Bluetooth

According to the new traffic rules, driving a motor vehicle can interfere with safe driving by dialing and answering mobile phone, you may lose 2 points for the first time. So it is recommended to choose a car DVR camera with Bluetooth.

Note: some GPS also has other entertainment, but they are unnecessary. 

top 10 dash cameras：

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In the event of an abnormal impact or vibration after the car shuts down, the dash cam will automatically wake up to record a video or take a few photos to record the situation around the car. The next time you start the dash cam, you will be prompted actively, and the sensitivity of the parking guard can be adjusted. If the sensitivity is too high,

The principle of the parking mode is same as an emergency, through G-sensor to wake up the dash cam to record. Some of the wireless remote-controlled game handles that are common around us also use this principle. At present, most of the car DVR recorder on the market use 3-axis gravity sensor, which has high sensitivity and small error.

The dash cam generally gets electricity from the cigarette lighter. After the car shuts down, cigarette lighter isn’t electric. So the dash cam parking mode must have an independent battery. Some high-end dash cam has the function of networking, once a stop monitoring alarm, the first time to the binding of the phone to send a message.

Parking monitoring can be said to be very practical, not only recording emergencies but also restoring the scene. So in the purchase of dash cam, you can choose a machine with this function, which will give your car to bring better protection.

top 10 dash cameras

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Why is the dash cam very popular nowadays? This is because of the increasing number of the racketeers of the accident. There are more and more cars in the cities, and the traffic becomes more and heavier. Once an accident happens, it is troublesome to judge the responsibility, especial some drivers with low quality.

Because of the various reason, the dash cam achieves high sales. According to the survey, the domestic dash cam market will reach 1.5 billion, more than 30 big brands in 2017. but because the dash cam doesn’t need high technology and low standard, small manufacturers use the poor quality material and relay on the price for competition. Although it gets a good result, user’s experience is not good.

Different product has a various price on the market, from tens of yuan to thousands of yuan, which is a big challenge for the drivers. In fact, whether a dash cam is good to depend on whether it can meet user’s need.

AZDOME, a leading brand, has launched a dual-lens dash cam, accurate track, six safe driving model, etc. Designed for user’s need, since released, it obtains many consumers.

AZDOME can record full HD image and present all detail, such as license plate, door plate, guide board, etc. In addition, the dash cam is able to intelligently deal with the noise. Intelligent lighting technology with high sensitivity makes night shooting effect clear, which provide a clear condition for the driver in nighttime and ensure the driving safety.

novice, female drivers, and careless drivers can have more professional assistance in driving to ensure the safe and happy driving. 

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HUB is a multi-port transponder. When HUB is the center device, even if a line in the network fails, it will not affect other lines' work. Therefore, HUB has been widely applied in LAN. Most of the time it is used in the star and tree network topology, connected to each host with the RJ45 interface (also with the BNC interface), and there are many kinds of HUB according to different statements. HUB can be divided into passive HUB, active HUB, and intelligent USB C HUB according to the way of input signal processing.

Passive HUB is the most low-level one. It does not deal with any signal, the transmission distance to the medium is not expanded, and it has a certain effect on the signal. Every computer connected to this HUB can receive signals from all the other computers on the same HUB.

The difference between active HUB and passive HUB is that it can amplify or regenerate signals so that it can extend the effective transmission distance between two hosts.

Intelligent HUB not only has all the functions of active HUB but also has the functions of network management and routing. In the intelligent HUB network, not every machine can receive signals, only with the same address, the portable computer can receive it. Some intelligent HUB can choose the best path by itself, which has a good management of the network.

HUB is a popular hub. It is used in the star topology network to connect multiple computers or network devices. The hub is also divided into 1. active 2. passive 3. hybrid. 1. kinetic energy: the function of regenerating and amplifying the signal on the connected network medium, so that the length of the connected medium can reach the maximum effective length, and the power is needed to work, and most of the HUB is for this type. 2. passive only acts as a connector. It can work without power supply, and it is rare in the market. 3. hybrid: it can connect various types of cables, such as axle and twisted pair.

Hub (HUB) is an important tool for centralized management of the network. Like trunk of the tree, it is a collection point of all branches. HUB is a shared device, the essence of which is a repeater, and the main function of the repeater is to regenerate and amplify the received signal to expand the transmission distance of the network. In the network, the hub is mainly used for the construction of the shared network, and it is the best and the most economical solution to directly from the server to desktop.

In a switched network, HUB is directly associated with switches, sending data from switch ports to desktop. The use of HUB network is flexible, it is in the network of a start node, the nodes connected to the centralized management, do not give out the problem of the workstation affects the normal operation of the whole network. Because HUB plays an important role in the network, it is also very important for its selection.

what is USB type c？

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