Shenzhen Tangreat Technology Co., Ltd. was established by Shenzhen Government in 1993, focusing on the development and marketing of telecom products: mobile phone jammer, wireless RF signal detectors and jammer satellite GPS (radio communication, military GPS Jammer, wireless communication Jammer, cellular NMT/CDMA Jammer, walky-talky TETRA Jammer, RKE, TPMS, FM radios Jammer, radio control airplanes Jammer, wireless toys Jammer, cordless analog phones Jammer, intelligent cell phone jammers, mobile phone signal isolators, cellular jammers, cellular phone jammers, cell phone blockers, mobile phone jammers), RF digital signal amplifiers (mobile phone signal amplifiers, mobile signal boosters, GSM repeaters, CDMA repeaters) and antennas.