Power is forever; 365 days 24 hours stand-by time; Hidden;

Voice trigger; The bug will call back to you if there is the voice arround it;

Unlimited distance; GSM network.

Features:
It is very high technology device, the advanced SIM audio detector, monitor, SIM card spy-ear. Comes with specially designed small casing, it doesn't need external software or configuration, just insert a valid SIM card into the SIM card slot, placing it at a inconspicuous location, you could listing to the sound of it's surrounding wherever and when you want to by making a phone call, it is the ideal SIM surveillance equipment you can't miss.

Please do not use it to engage any illegal activity. It works with system at 900/1800.

Specification:
Frequency: 900, 1800, (Pls do not plug the CDMA SIM card for the device, It will not work with the CDMA Card)
Embed four condense microphone
24 hours continuous usage.
All GSM SIM card compatible
Microphone range: 10~14 Meters (diameter), 4 direction
Receive sensitivity: -\+ 10K
Working temp: -40~50 degree C
Responding frequency: 1.2K~800KHz