Weight: 2.75 oz (78 g), including 2 AAA alkaline batteries
Specifications: Interface: Bluetooth 4.2
Wireless frequency: 2.4GHz frequency range
Wireless range: 33 feet (10 meters) in open air, up to 16 feet (5 meters) in typical office environment
Buttons: Left, right, middle button, wheel, and power (pairing button by long press)
Tracking: Microsoft propriety BlueTrack Technology Windows 10/8.1
Compatibility: Windows 10/Windows 10 ARM/Windows 8.1/Mac OS 10+/Android 6.0+
Battery life: Up to 12 months typical usage