Logitech MK540 ADVANCED Wireless Keyboard & Mouse Sets (1)Specifications Mouse Sensor technology: High-precision optical tracking Sensor Resolution: 1000 DPI Number of buttons: 3 Scroll Wheel: Yes - Mechanical Wheel Buttons: Center Button Unifying Mouse: No Unifying Uplink Receiver: No Battery life (mouse): 18 months Battery type (mouse): 1 AA battery Keyboard Battery Life (Keyboard) 36 months Battery type (keyboard): 2 AAA batteries Wireless Distance: 10 meters Wireless Technology: Logitech Micro Receiver (2) Compatibility Receiver Requirements: Available USB port Windows ® 7, 8, 10 or later Surface compatibility (3) Technical Specifications WiFi range (meters): 10 meters Spill-resistant design Familiar key shape and feel, quiet design Adjustable height: 3 tilt angles Special keys: music control, programmable keys Palm rest Abrasion-resistant keystroke imprint 10-key numeric keypad