Work with 2*AAA battery                                                   
LED for bluetooth connection                                 
Bluetooth V3.0, support Android system                                            
Signal type:Broadcom ,BCM 2042chip          
specification ﹕
A. Working  frequency: 2.400GHz-2.483GHz
B .Working distance: 10m
C.Battery:7#2*AAA battery                
D.Charging time: 2 hours,
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