Built for endurance, versatility and comfort to help you succeed in a multi-device world. Youll be powering through tasks thanks to the Easy-Switch technology that lets you switch seamlessly between three computers. Youll fly through documents and web pages using the hyper-fast scroll wheel, with hardly a thought to changing batteries thanks to 24 months of power on one AA battery. The medium-sized sculpted shape fits comfortably under your hand and the keys are designed to withstand up to 10 million clicks. You can connect to Windows and Mac via the tiny Unifying receiver or via Bluetooth Smart wireless technology. Connector/Port/Interface: USB Left/Right Hand Use: Right Mouse Technology: Optical Wired/Wireless: Wireless.