... range:GSM,GSM,DCS,PHS and 3G signal ET101B Portable mobile phone detector1. TechnologyDetects wideband:a. can detects th RX frequency(CDMA ... light(Blue)& RF detecting light(Red).*When it find the mobile phone signal, the red light will be on, much nearer to ... , music hall etc3, Prison, jail4, Gas station, oil station, oil field etc5, Every place which not allowed to use the mobile phone EST101B ...