This powerful pocket-sized portable mobile cell phone jammer will jam all nearby mobile phones,within an effective range of up to 6 meters. If you're looking to buy a portable cell phone jammer, this is an excellent choice for a personal, portable unit. Isolating area: Radial: 2-6m CDMA869-894MHz GSM: 930-960MHz DCS:1805-1880MHZ PHS:1900-1925MHz Accessories: Battery 1300mAh(2hours) One jammer Three indoor antenna