... radius still depends on the strength signal in given area Mobile signal shielding device Specifications: Tx Frequency (A)TX frequency ... TACS,NMT) and digital (GPRS,GSM, DCS,CDMA,PDC,TDMA,PHS,PCS,IDEN,W-CDMA,UMTS) Working Area1. Conference room, auditoriums, ... cinema, theater, and hospital etc.2. At places where using mobile phones is prohibited such as government, military, finance, security, police and ...