1, shielding range Radius 15 - 20 M 2.The jamming radius still depends on the strength signal in given area Mobile signal shielding device Specifications: Tx Frequency (A)TX frequency 869-894MHz/925-960MHz (B)TX frequency 1805-1880MHz/1900-1990MHz Available system Include analog (AMPS,TACS,NMT) and digital (GPRS,GSM, DCS,CDMA,PDC,TDMA,PHS,PCS,IDEN,W-CDMA,UMTS) Working Area1. Conference room, ...