Built in Li-ion battery, rechargeabe via USB cable.
Micro 5Pin USB 3.0
LED for bluetooth connection
Bluetooth V3.0, support Apple & Windows system

Electrical specification:
A. Working frequency：2.400GHz-2.483GHz
B .Working distance：10m
C.Battery：Polymer lithium ion battery (3.7V) volume:180MAh
D.Charging time：2 hours，Uninterrupted working time: 100-hour
E.Standby 90 days
F. Working current：<2mA @ 3V
G. Sleeping current：<50uA @ 3V
H. Sleeping mode：The keyboard automatically enter sleep mode when you are not using in 20 minutes.
I. Sleeping waking way：To press any key