Wireless 2.4GHz connectivity Effective wireless range: 100 meters Laser power: less than 1 mW or less than 5 mW; charging time: 2 hours About 48.5g in weight (with battery) Dimensions: 145.5 L by 20.35 W by 17 H mm System requirements: Windows 10/7/XP, Android 4.0, Mac Keyboard, or later