... battery, AC adaptor, PCB and components, GSM module, thermal printer and firmware, among them, only PCB and firmware ... parts inside such as GSM module, shell, antenna, thermal printer is designed and manufactured by other companies. Furthermore, ... SIM card interface: 3V Antenna: SMA connector8) Thermal PrinterPaper: Thermal paper roll, 58mm wideEffective printing area: 48mmCharacter: 12*24 dotsNumber ...