Total Output Power: 1000 Milliwatts Effective distance: 20 to 40metres (in optimum conditions) 1 Watt total power, range up to 30 metres (in optimum conditions) THIS IS NOT A CELL PHONE JAMMER, IT IS ONLY FOR GPS L1. RF total power: 1 watt - Block range: GPS L1 within 20 ~ 40m radius - Handheld (Portable) Size and Aluminium Case - Jammer battery life: Up to 2.5 hours - Jammer uses internal rechargeable battery and a/c power or cigajack in car. - Quick Charging: 3 - 4 hours - Battery type: Internal rechargeable 3.6V 2500mA Ni-MH battery pack - Supplied with a/c adapter and cigajack type adapter for car - Size: 60 x 100 x 30 mm (weight: 500g (including battery)).