USB 2.0 A to RS-232 adapter with 0.6m extension cable. Connector: USB 2.0 A plug - RS232 (DB9) plug. Supported Operating Sytems: Windows 8, Windows 10, NOT Windows 7, from MAC OS 8.6. With drivers on CD. It supports auto-wake-up and power management. The adapter is used to control devices with RS-232 interface.