This amazing compact GSM bug is disguised as a standard mobile phone battery, that can be left lying around anywhere without attracting attention or suspicion. You could leave it lying on your bed, on a shelf, or even under the sofa, no one would look at it twice! Inside the dummy battery is a concealed, covert GSM listening bug with a high sensitivity crystal clear microphone allowing you to dial in from anywhere in the world and listen in to the targeted area. Network: GSM 850/900/1800/1900 (works worldwide) Power consumption: In standby mode (not listening) 3 days and about 3 hours listening time. Dimension: 55 x 40 x 7 mm.