Functions of a cell phone signal jammer: it could block any mobile phone signal from coming in. While you are operating businesses you recognize that the individuals are heading for coming in as well as gabbing on their phone the full time the cell phone signal blocker could check people from being troubled by the phone cell phone signal blocker is originally developed for law enforcement and the military to interrupt communications by criminals and terrorists corporations use jammers to stop corporate espionage by blocking voice transmissions and photo transmissions from camera phones feature: - taking use of super-high frequency and mini-power interference technology, high efficiency. - effectively making subsection, just interfering downlink and no interception on the base station. - extreme portability, the weigh for machine itself is very light. - slow start us design of circuit .These elements can maintain the s table operation condition with high integration - built-in lithium-ion battery, reusable and durable - portable easy to carry around you main locations: gas stations, oil and gas storage facilities, oil and gas fields, hospitals, theatres, recording studios, banks, contract tendering rooms, churches, conference rooms, classrooms, testing facilities, security services, military units, secret services, news conference rooms, libraries, museums, prisons, courts, border patrol and drug enforcement, customs, houses. Specifications: output port frequency (mhz) average outputting channel export power cdma 869-894 33 dbm 8 dbm/30khz gsm 925-960 33 dbm 5 dbm/30khz dcs 1805-1880 33 dbm 2 dbm/30khz 3g wcdma 2110-2170 33 dbm 2dbm/30khz power consumption :16w size : 24176cm power supply: ac:110-240v dc:5v 8a jamming range :25meters (according to the mobile operators’ signal condition ) work temperature：-40degree to +55 degree.