... .Communication: GSM, WCDMA, HSPA and CDMA2000 1xDV-DO.Operating power: 7.4V, 2200mAh.Lithium backup power: yes.RTC: yes. 1. Compact ... : GPS, camera, RFID, etc. 6. Built-in one-dimensional scanning module 7. Communication mode: Wi-Fi communication, GPRS / GSM communication, Bluetooth communication ...