Welcome to our shop! 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 New 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 100% Satisfaction: Our customers are our top priority. If you find any product problems after receiving the goods, such as damage and incorrect quantity of goods, please contact the seller immediately. We try our best to provide you with satisfactory after-sales service.