Features:1. 100% Brand new and high quality RS485 Board.2. No need external power, powered by USB port.3. LED display of communication data.4. Machine PLC data reading and writing.5. Monitoring data read and write, and PTZ control.6. Centralized control of household electrical appliances.7. Access Control System: Card.8. A variety of industrial automation: Instrumentation.9. Parking: Bus Fees.10. Dining Hall: Staff Attendance.11. Highway toll station: ATM machine.Specification:Condition: 100% Brand NewItem Type: USB Serial ConverterMaterial: PlasticColor: BlackTemperature Range: -40C - 85CCommunication Distance: 1200 m(maximum)Product Size: Approx. 6.0*1.7*1.8cm / 2.4*0.67*0.7inchPackage list:2 x USB to RS485Notes:1. The actual product color may deviate from the photo due to light.2. There may be a slight deviation in the measurement of product..