Simple and reliable mouse is contoured for comfort. Features 2.4GHz wireless technology with virtually no delays or dropouts. The onoff switch and smart sleep mode help the battery last up to one year. Nano receiver stays in your USB port for safe-keeping. ConnectorPortInterface: Nano Receiver; LeftRight Hand Use: LeftRight. Part Numbers:LOG-910002225 LOGTEC M185 WIRELESS MOUSE, BLACK UPC: 097855074126