E840-DTU(GPRS-03) GPRS Transceiver Module RS232 RS485 GSM Wireless Transmitter Quad-band 850/900/1800/1900MHz Reciever Module E840-DTU(GPRS-03) GPRS Transceiver Module RS232 RS485 GSM Wireless Transmitter Quad-band 850/900/1800/1900MHz Reciever Module. Sale price : $19.50 Category : Phones & Telecommunications