Type:Broadcom ,BCM 2042chip 
specification 
A. Working frequency 2.400GHz-2.483GHz 
B.Charging time2 hours
C.Standby 90 days
D. Working current
E. Sleeping current
F. S
leeping modeThe keyboard 
Automatically enter s
leep mode when you are not using in 20 
minutes.
G. Sleeping waking wayTo press any key