Happy Hacking Keyboard Professional PD-KB600B The wireless model who did based on a Professional series with an ideal key touch. Bluetooth(R) HID It corresponds to a multi-device of a smart phone tablet as well as a PC corresponding to a profile. The AA battery-shaped capable of acquisition in a power supply, a dry battery is adopted. An AA battery-shaped, I move for about 3 months by 2 alkaline batterieses. It's also equipped with USB micro-B connector for electricity supply. A key capacitance nothingness point of arrangement which detects a change in the capacitance value when pushing it down, and keys in system is adopted.