1000 dpioptical sensor Provides fast and accurate tracking Number of buttons: 3 Smooth organic shape with soft rounded sides Connectivity: Bluetooth or Logitech receiver Compatible with Windows 7, 8, 10, Mac OS 10.10 (or higher), Chrome OS, Linux Battery life: 18 months with one AA battery (pre-installed) Dimensions: 59 x 107 x 26.5 mm Weight: 100g