Specification:

Frequency: 900, 1800,(Not avaible for CDMA or 3G)

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

It is very high technology device, the advanced SIM audio detector, monitor, SIM card listening-ear. Comes with specially designed small casing, it doesnt need external software or configuration, just insert a valid SIM card into the SIM card slot, placing it at a inconspicuous location, you could listening to the sound of it's surrounding wherever

and when you want to by making a phone call.It can used as detectaphone when SIM card is entered. It has the common shape of generachargers, very covert, not easy to be discovered. The detectaphone can be rechaged while battery charging is on.
   

Please do not use it to engage any illegal activity. Compatible for 900/1800 frequency SIM cards