2PCS USB to RS485 Converter Adapter Module For Win8/Win7/Linux/XP/Vista Features: 1. 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: Item Type: USB Serial Converter Material: Plastic Color: Black Temperature Range: -40°C - 85°C Communication Distance: 1200 m(maximum) Product Size: Approx. 6.0*1.7*1.8cm / 2.4*0.67*0.7inch Package list: 2 x USB to RS485 Notes: 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.