... .The jamming radius still depends on the strength signal in given area Mobile signal shielding device Specifications:Tx Frequency (A)TX frequency ... -1990MHzAvailable system Include analog (AMPS,TACS,NMT) and digital (GPRS,GSM, DCS,CDMA,PDC,TDMA,PHS,PCS,IDEN,W-CDMA,UMTS ... government, military, finance, security, police and command center etc. Mobile signal shielding device MCD433G