Specification :-

Dimensions : 68mm x 39mm x 18mm
Work with bands (800MHz, 900MHz, 1800MHz 1900MHz)
SIM Card slots - work with  GSM sim card  ( not for 3G)
Microphone range : 5-7 meters (radius)
Power input: AC100~250V 50/60Hz
Power Output: DC 5V, 400-500mA
No distance limited, user can listening everytime everywhere
Stand-by time: 10 days
Easy to set-up
Control by any phones / mobile phones
Built-in rechargeable battery
You can hear this Sim Card Spy Ear from anywhere, and just dial in to this Sim Card