high quality No need external power, powered by USB pt Fully compliant USB 2.0 stard , backward compatible with USB1.1 Suppt System: Windows XP , Vista, Windows 7 , Linux , MacOS , WinCE5.0 drive All kinds with RS485 pt device parameter settings , data communication USB-RS485 converter adapter USB connect: to PC RS485 connect: to RS485 device Suppts baud rate range: 75-115200bps, up to 6Mbps Operating temperature range: -40C - and85C Communication distance: 1200m (max.) Size: 6.1x1.6x1.3cm Black colour Sht 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 products are not included. Note: Light different displays may cause the col of the item in the picture a little different from the real thing. The measurement allowed err is 1-3cm.