Product Name: 4 channels GSM FWT with auto IMEI changer Price: US$
Detail: function : 1) GSM 850MHz 900MHz 1800MHz 1900MHz CDMA 800MHz(Optional) 2) standard RJ-11 to telephone or voip gateway & PABX 3) 450Hz Dial-tone and Busy-tone 4) 50V in idle and 75V in ringing and 9-12V in talking 5) DTMF detector in RJ-11 6) precise reverse polarity <