... ,GPRS, RFID reader is optional 3.5" PDA ,handhelds,handheld device,handheld terminals, with barcode reader,GPRS, RFID reader is optional1.Operation ... )7. Backup: SD card or FLASH8. Develop environment: MS EVC 4.0 & VS.NET 20059. Battery: 1800mAh lithium-ion battery10. IP ...