... battery, AC adaptor, PCB and components, GSM module, thermal printer and firmware, among them, only PCB and firmware is designed ... parts inside such as GSM module, shell, antenna, thermal printer is designed and manufactured by other companies. Furthermore, if ... <2.5ppm Receiver sensitivity: <-108dBm Transmit power: 1V SIM card interface: 3V Antenna: SMA connector8) Thermal PrinterPaper: Thermal paper ...