Specifications: Interface: Bluetooth 4.01/4.1/4.2
Wireless Frequency: 4.2 GHz frequency range
Wireless Range: 33 feet (10 meters) in open air, up to 16 feet (5 meters) in typical office environment
Buttons: 4 buttons: Left, right, wheel, and power (paring button by long press)
Scrolling: Microsoft propriety BlueTrack Technology Windows 10/8.1
Compatibility: Device must support Bluetooth 4.0 or higher (Note: Many Apple and Windows 7 devices do not support Bluetooth 4.0)
Battery: 2 AAA alkaline batteries (included)
Battery life: Up to 12 months typical usage