USB 2.0 to RS485 Converter and all kinds of 485 interface docking, transmission distance up to 1000 meters. Mainchip:CP2102(SILICON LABS) ,Industrial chip, high quality, super stable. The Lead PINS include: A +, B-, GND ,GND,5V0 Industrial Product, With 15KV ESD protection and TVS overvoltage protection Supports Windows 2000, XP, Vista, Window 7,8,10, Mac OS 9, Mac OS X & Linux. WARRANTY:DSD TECH back this usb to rs485 adapter with 12 months warranty.If you meet any question, please contact us, we will fix your issue within 24 hours.