Portable Cellular Phone Breaker jammer output 2900 mw and has a range of up to 20 meters in the right conditions. It is supplied with a universal power supply and rechargeable battery, Li Battery AC110V/220V-DC12V/ 2500mA/h. This Jammers is used Continues for 180 minutes typically used by the police and military to control or disrupt communication during hostage situations and bomb threats. Features and Specifications ? Tx Frequency: 870~960Mhz, 1805~1918MHz, 2100~2170MHz ? Battery: Li Battery AC110V/220V-DC12V/ 2500mA/h, ? Continue Using Time: 120~180 minutes ? Dimension: 112mm(H)x62mm(L)x32mm(D) ? Jamming range: Radius 5~20 Meters (Signal=-75dBm)