... back worldwide workable adaptor, USB port to charge electronic products TC-300 GSM plug audio bug, wireless audio bugGSM plug audio ... interval8,Active listening9,frequency 900/1800MHZ or 850/1900MHZFunction Operation: TC-300 will start work when plug,then it can auto ... new card.Network GSM900MHz/DCS1800MHz GSM850MHz/DCS1900MHzAccessories: Host 1 set TC-300 GSM plug audio bug, wireless audio monitor