101A cell phone signal detector Semidiameter of interception: 1-20 m(-75dBm) Detailed Product Description Output portFrequencyCDMA824-849MHZGSM890-915MHZ DCS1710- ... weight: 200G Dimension: 97(L) ×60(W) × 23(H)mmApplication:1. Conference room, auditoriums, law court, library, exam room, school, cinema ... , Customs, etc. 101B mobile phone signal detector Semidiameter of interception: 1-20 m(-75dBm)