and high quality No need external power, powered by USB port Fully compliant USB 2.0 standard , backward compatible with USB1.1 Support System: XP , Vista, 7 , Linux , MacOS , and WinCE5.0 drive All kinds with RS485 port device parameter settings , data communication USB to RS485 Converter Adapter USB connector: to your PC RS485 connector: to your RS485 device Supports baud rate range : 75bps - 115200bps , up to 6Mbps Work temperature range: -40°C ~ +85°C Communication distance :1200m(max) Dimension:6.1x1.6x1.3cm Color: Black Short distance , such as parameter settings of the computer peripheral equipment , the use of common data lines can be. LED display of communication data Machine PLC data reading and writing Monitoring data read and write , and PTZ control centralized control of household electrical appliances Access Control System ; card a variety of industrial automation ; instrumentation Parking ; bus fees Dining Hall ; staff attendance highway toll station; ATM machine Download Package includes: 2 x USB to RS485 Converter Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.