Upgrade to smarter scrolling, better comfort, and more productivity. The Signature M650 features SmartWheel scrolling that delivers precision or speed the moment you need it. Measurement: 4.26" H, 2.4"W, 1.52"D, 3.58 oz weight Nominal Value: 400 dpi Max value: up to 4000 Can be used with Windows or macOS. Battery: 1 AA Connection Type: Bluetooth using the USB receiver included