Features:_x000D_ 1. 99.99% Brand and high quality RS485 Board._x000D_ 2. No need external power, powered by USB port._x000D_ 3. LED display of communication data._x000D_ 4. Machine PLC data reading and writing._x000D_ 5. Monitoring data read and write, and PTZ control._x000D_ 6. Centralized control of household electrical appliances._x000D_ 7. Access Control System: Card._x000D_ 8. A variety of industrial automation: Instrumentation._x000D_ 9. Parking: Bus Fees._x000D_ 10. Dining Hall: Staff Attendance._x000D_ 11. Highway toll station: ATM machine._x000D_ _x000D_ Specification:_x000D_ Condition: 99.99% Brand _x000D_ Item Type: USB Serial Converter_x000D_ Material: Plastic_x000D_ Color: Black_x000D_ Temperature Range: -40C - 85C_x000D_ Communication Distance: 1200 m(maximum)_x000D_ Product Size: Approx. 6.0*1.7*1.8cm / 2.4*0.67*0.7inch_x000D_ _x000D_ Package list:_x000D_ 2 x USB to RS485_x000D_ _x000D_ Notes:_x000D_ 1. The actual product color may deviate from the photo due to light._x000D_ 2. There may be a slight deviation in the measurement of product. 199.99% Brand and high quality RS485 Board. 2No need external power, powered by USB port. 3LED display of communication data. 4Machine PLC data reading and writing. 5Monitoring data read and write, and PTZ control.