Specifications Tx Frequency (A)TX frequency 851-960 MHz (B)TX frequency 1805-1990 MHz (C) Tx frequency 2100-2170MHz Available system Include analog (AMPS,TACS,NMT) and digital (GPRS,GSM, DCS,CDMA,PDC,TDMA,PHS,PCS,IDEN,W-CDMA,UMTS) Total output power (A) +25dBm / 300mW (B) +25dBm / 300mW (C) +25dBm / 300mW Battery Ni-H battery DC 12V / 1600mA/h Continue using time 90 minute First time battery charge need 2 hours up Jamming range Radius 15 - 20 M 【the Cellular signal must ≧-85dBm in the location】 The jamming radius still depends on the strength signal in given area Safety regulation AC Adapter UL (E190582) CSA (LR112971 Level 3) Dimension 110(H)?2(L)?0(W)mm not include antenna Weight 300g