1. Black backplane-circuit board, high quality 2. Standard 3.81mm industrial plug, There is also a pin interface. Suitable for more flexible applications 3. RS485 transceiver is automatically switched, No need to switch direction, data stream switch 4. Double LED lights: indicate the status of receiving and sending, LED light: indicates power supply status 5. Onboard voltage regulator chip, Support wide voltage power supply 3.3V~5V6, wide voltage, industrial grade RS485 chip TVS interface protection, high protection, industrial quality products, stable and reliable system Included: Standard 3.81mm industrial plug 2.54 pitch pin