CJ-Series is a cellular jammer designed to jam 4 frequency bands - CDMA/TDMA+iDEN (Nextel), UMTS (3G), GSM and High GSM. Frequency overages; 465 to 467MHz, 860-960MHz, 1800-1990MHz, and 2100-2200MHz. CJ-Series paralyzing 2 way full duplex RF links between cellular phones. As a result, all cellular phones within the protected area will not be able to receive or transmit calls. Jamming radius upto 600 Meters (depending upon signal strength). Filters available to protect police radio operation.