Beware of the size (15cm maximum) but the bottom just functional reagent, buy for a raspberry and Arduino, perfect for typing programs and messages or other, the only fault I was unable to connect to my android tablet, unrecognized and failed to find drivers, even running on a PC to replace a keyboard and a mouse. Currently serves remote in my wheelchair cinema for children (under 5.1 driver multimedia raspberry station), strong enough self-correct more.