Jm135009 cell phone jammer is a kind of information security product used for blocking cell phone signal around users. It is more and more popular in the security product's market currently. Cell phone jammer causes enough interference with the communication between cell phone and stations to render the phones unusable. Ocking area. -t135009 model cell phone jammer is especially designed for using in examinations for schools, universities and test centers. It doesn¡¯t have a good cooling system, so the cell phone jammer can not be used continuously. -install the antennas corresponding to the channel label. If not, the jammer will be very hot when it works ? Technical specifications Jamming area: up to 20meters (depends on signal strength, at the site to be jammed) Cellular systems: Option a for american market -cdma 850-894mhz -gsm 925-960mhz -phs/dcs 1805-1990mhz -3g 1990-2170mhz Option b for europe market -cdma 869-894mhz -gsm 925-960mhz -dcs 1805-1880mhz -3g 2110-2170mhz Power adapter: input ac160v-240v, dc5v Total out Box