... 10000 pcs available Communication portUSB flash driver & Crossed RS232 serial port Boundrate 57600,9600 adjusted,support auto matchUSB ... on-board,can adjust test modelFunction expansionRF wireless modular,temperature & humidity sensorElectrical parameters +5V DC(4.5V~6V),Power ... 10000 pcs available Communication portUSB flash driver & Crossed RS232 serial port Boundrate 57600,9600 adjusted,support auto ...