and No need external power, powered by USB port Fully compliant USB 2.0 standard , backward compatible with USB1.1 Support System: Windows XP , Vista, Windows 7 , Linux , MacOS , and WinCE5.0 drive All kinds with RS485 port device parameter settings , data communication USB-RS485 converter adapter USB connector: to PC RS485 connector: to RS485 device Supports rate range: 75-115200bps, up to 6Mbps Operating temperature range: -40C ~ +85C Communication distance: 1200m (max.) Size: 6.1x1.6x1.3cm Black colour Short distance, such as computer peripheral equipment settings, the use of common data lines can be. control centralized control of household electrical appliances Access Control System; cards of industrial automation; appliances parking; bus fees Canteen; staff attendance road station; ATM Download Package Contents: 1 USB to RS485 converter Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.