This jammer system comes with a built in rechargeable Li-ion battery for Hours of signal jamming, and with the included car power adapter, recharge And use this in your car as well as the office. Incredibly easy to operate, just Switch it on and it will immediately start blocking CDMA, GSM, DCS and 3G to Keep your immediate surrounds annoyance free. Specifications: Isolating Signal Bandwidth - GSM/CDMA: 850~960MHz - GSM/CDMA1900: 1805~1990MHz - 3G: 2110~2170MHz Typical Coverage: 8 Meters Average Output Power: 10 dBm Typical Battery Life: 2 Hours Power supply: Built in Rechargeable Li-ion battery Dimension: Antennas off - 97mm x 45mm x 19mm (L x W x D) Package Contents: 1 x 3G GSM CDMA Broad Spectrum Cell Phone Jammer TG110A 1 x Power Adapter 1 x Car Power Adapter