Just got this keyboard. Been playing with it for a couple of days.
Some comments
1. Bluetooth support multi-pairing - can pair with both my PC, and HP
2. Can be use with usb cable mode or bluetooth mode (fn+insert for bluetooth), (fn+delete for usb mode)
Nice feature to be able to toggle between two device eg. PC on usb cable, handphone or tablet on bluetooth
3. No physical switch to switch on the keyboard, just need to press fn+insert keys for about 3 second to on and vice-versa.
IMO, this is better than using a phyiscal switch. I use to own a Filco Minila Air which need to flip a small switch locate on the bottom which I found to be a hassle.
4. Battery is built in, and charge using the mini usb cable. Battery capacity suppose to be 1200. I had not use it enough to know how long a full charge hold.
5. Documentation is in chinese. I got a friend to translate. Not much really. No mention of multi paring etc unlike the Filco Minila Air.
6. No apparent lag, if not use in 10 minutes, keyboard will go to sleep, press any key will "wakes' it up
Backlight on my keyboard is broken. Work initially when I first got it (fn+arrow up). I got a red casing just like the picture above, but with white caps. I decide to change the keycaps to another set. Could not on the backlight since. Try numerous keystrokes combo etc. The best I can it on certain occasion where I keep pressing fn+arrow up, the whole keyboard with blink. Dunno what the problem here.
I discover that the spacebar, while it is standard size, the stem gaps at the edge are different from my other keyboard.
Overall, I really like this keyboard. Been looking around for a portable mechanical keyboard for travelling. I first got a Minila Air but found that right shift key is just too small for my liking. Had since sold off.