Microsoft Bluetooth Desktop Mouse & Keyboard Combo (OEM package) - Mouse Sensor: Red Tracking System - X-Y Resolution: 1000ppi - Tracking Speed: 762mm/s - Connectivity: Bluetooth Low Energy 5.0 - Wireless Range: Up to 10m (Open Area), Up to 5m (Typical Office) - Battery Life: Up to 12 Months with 1x AA Battery (Mouse), Up to 3 Years with 2x AAA Batteries (Keyboard) - Dedicated Office and Expressive Input (Emoji) Keys - 12 Months Limited Warranty - Open Box

Manufacturer Warranty: 12 Months Limited Warranty

Manufacturer Contact Info: http://www.microsoft.com/en/au/default.aspx, 13 20 58