... .frequency range:GSM,GSM,DCS,PHS and 3G signal ET101B Portable mobile phone detector1. TechnologyDetects wideband:a. can detects th RX ... . (It still depends on the strength signal in given area).*Working light(Blue)& RF detecting light(Red).*When it find the ... Temperature:-20°C ~ +65°C;Relative humility:30% ~ 70%;2.Working Area1, Every Examination room2, Conference room, theater, cinema, music hall ...