... consumption, such as market, bus ticket system 4. fingerprint, GPRS optional POS Machine with Printer Main ApplicationsFinance consumes; Small sum ... 1200bps) SDLC; support V.29 FastPOS SDLC; support connection with China UnionPay, Visa, Master, etc.13. (Optional) ... one RS232 interface, one infrared interfaceBattery system: 2000mAH recharge lithium battery, with a button battery to keep the clockBuzzer ...