... standard POS functions, the M3000 features GPRS/GSM, CDMA, LAN, Wifi and Modem networking capability. Also, ... , bidirectional swipeCommunication: GSM/GPRS module,900/1800MHz (CDMA, WIFI, dial-up modem optional)3xPSAM slot, ... slotBacklit graphic screen: 128x64pixels, LED backlight, 16-grade grayKeypad:18 silicone key, dust proofPort: 2 RS232 ... , 50Hz/60Hz Output 9VDC, 4A Wireless Mobile POS terminal