Suitable is the keyboard for tablets and smartphones with Android, IOS, and partially Windows PCs and laptops. I have tested the keyboard on my OnePlus One, on a Samsung Galaxy S2 / S4 and Galaxy Tab. Everything worked right away without any problems.
The range should be about 10 meters, so I can confirm, though I'm going to need this range in the rarest cases.
The built-in lithium-ion battery provides a long duration of approximately 3 months, it can be charged either with the included micro-USB cable or the power supply of a smartphone, which is very convenient.
To switch one needs only the back of the device flip a switch, then lit a small LED front. Here also over an empty or full battery appears. For pairing you need the "FN" key and the "C" key (first time only).
The keyboard keys have a pleasant pressure point, there is no loud clatter. Overall a very quiet typing.
I hope my review has helped you in your buying decision, I can absolutely recommend this keyboard.