Because I occasionally typed on the tablet, I experienced a lot of inconvenience, and I always thought that I wanted a keyboard that could be used across devices. First introduce my equipment: PC, iPad Air 2 and iPhone 6. At first, it was Logitech's K480. The price was right, but there were two shortcomings for me: 1, connect to the PC need to buy another Bluetooth adapter; 2. The built-in equipment support rack is of little significance to me. I can place my mobile phone but it is not just necessary. If you have a flat panel, you do not need to have a smart cover. Until suddenly discovered a few days ago Logitech recently released a K375s keyboard, read the presentation seems to meet all my needs, the price is within the budget. Jingdong’s own words are 199. Occasionally there are promotions. The price of Taobao is basically between 160 and 170. Later, Jingdong’s global purchase base price is 149, and orders are placed immediately. Unfortunately, the one I bought went through the express delivery, causing me to receive the goods one day later. It seems that I haven’t seen value-friend related sun bills before posting, so I accidentally became the first sun (maybe everyone thinks this thing can't really get it.) The packaging of the keyboard is relatively simple and simple. A long box does not have much to introduce. The size of the box is 47cm x 14cm, and the keyboard body is even smaller, so it is still quite light, and occasionally needs to be carried without too much trouble. The contents of the package are shown on the side, including a keyboard, two 7-cell batteries, a mobile phone stand, a Bluetooth receiver, and an instruction sheet. ↓ In addition, the use of the technology indicated on the side, where the adapter uses Logitech's unifying technology, seems to be able to unify other Logitech products, but I have no other Logitech equipment to explain this in more detail. The four features of this device are described behind the cassette: multi-device switching, quiet input, bracketing, and support for multiple operating systems. ↓ Adapter is very mini, for comparison I purposely found a one-corner coin for comparison. note! It is one corner! Not 1 yuan! First of all, say the connection problem. Because it is the first time that an external Bluetooth keyboard is connected, and it is not clear what the other devices are, after selecting and pressing the F2 key, the Bluetooth device on the iPad will be prompted to enter a random verification code. remember! After typing, you must press Enter again! I didn't know at the beginning that the input was over. The result waited for a long time and I didn't think it was a fake.... The feel of the keyboard is more general, but silence is true. Although there is no sound at all, at least the same office will not complain again. The keyboard is really thin from the side, but it also greatly affects the feel. The default device for switching keys is F1~F3, where F1 is the default connection adapter, not manual and it is not recommended to modify it. The indicator will light for about 3 seconds when switching the device. The auxiliary functions are set on the keyboard from F1 to F12, so the default is to turn off the original F1~F12 keys. For those who need to use F1~F12 often, they can be locked by Fn+esc, but when doing so, they must use Fn+F2 or F3. However, if you switch from iOS, it is still the default F2 or F3 key. It is worth mentioning that the keyboard is equipped with a small numeric keypad, which facilitates the input in some cases. Unfortunately, it is said that there is no indicator light to save power, which is a pity. In fact, it's not always a long time to enter text on a tablet or mobile phone, but it's still convenient when it is needed occasionally. In addition, it seems that the external keyboard is not very friendly to the third-party input method, because I have always used my own input method and did not want to try third parties, so this situation is not very understanding. When I make up a photo with a keyboard and a tablet, I'm not a text worker. I need to use a keyboard every day to type on an iPad. It's my daily diary time. I also recommend a well-known diary app. Called Day One, but not much to introduce here. In iOS, holding down the key in the case of an external keyboard can display some common shortcuts for the current App. And the contents of the bar at the bottom left of the screen will be changed according to the application that is not used. This is a bit like the prototype of the Touch Bar. But the actual use of the actual adaptation of the basic is not the only difference is that the information input interface has a handwritten button, do not know if I think too much. When the keyboard is switched to the iOS device, pressing any key can activate the input password interface, and can enter the password through the keyboard to enter the interface. Unfortunately, I did not find a shortcut to lock the screen, so each time I used up to lock the screen had to reach out and press the lock screen key. Another thing I hope I can satisfy is that when I type, I can hold down the Shift key + arrow keys to select some text, but I can't call up the shortcut bar. That is, I click on the selected text directly on the screen and it pops up. The shortcut buttons in the bar, among which simple and complex switching, querying, reading, and sharing are all useful or interesting functions. It is a pity that we cannot call directly through the keyboard. This is somewhat regrettable. In summary, the iOS system only improved the typing experience after the external keyboard, and many of the features are still implemented with the screen click, or hope that Apple can do some other interesting and useful things in this regard, after all, it is also interested in Take the iPad Pro series to productivity. KNB6-40 Miniature Circuit Breaker
KNB6-40 Mini Circuit breakers, also named as the air switch which have a short for arc extinguishing device. It is a switch role, and also is a automatic protection of low-voltage electrical distribution. Its role is equivalent to the combination of switch. Fuse. Thermal Relay and other electrical components. It mainly used for short circuit and overload protection. Generally, According to the poles, mini Circuit breaker can be divided into 1P , 1P+N , 2P, 3P and 4P.
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The back of the package 
The size of the adapter is relatively simple when compared with the bracket, but it is not bad. Because the touch part of the mobile phone is plastic, I feel flustered and added a layer of leather by hand. It was the time left before the practice of hand-made leather. There was no surface treatment, no edge-sealing treatment, purely cut and glued, it was such a day (lan ) Ran (lan) no (lan) repair (lan) ornaments (lan) make more pictures, you can see the phone is still appropriate when standing on the shelf, hesitation before the phone is streaking state, how much still have to consider not Casually put it away, now there is no such trouble. 
Mobile phone holder 
Small number keyboard 
Shortcut display 
Legendary Touch Bar Prototype 
Shortcut button bar
First, open the file