Microsoft Arc Touch Bluetooth Mouse Curve for comfort, flatten and to pack. A perfect fit for your hand and your mobile lifestyle. Curve to turn on. Flatten to turn off. No button to switch. A green light flashes to show the battery is working and then turns off to save battery life. Clutter free and reliable experience utilizing the latest in Bluetooth 4.0 technology. Click. Tap. Flick. Control. Quickly brush up or down with your finger to flick into hyper fast vertical scrolling for smooth, intuitive navigation. Take advantage of the BlueTrack Technology, which combines the power of optical with the precision of laser for remarkable tracking. This product only compatible with Windows 8 (or higher)