Logitech MK470 Slim Compact Wireless Keyboard Pebble Mouse Combo Bundle Set Animal alphabet SKU: AC01758 SKU: AC01758 The pillow soft straps that adjust at the shoulders Windows® 10 or later Works with Surface Sensor technology: High Precision Optical Tracking Sensor resolution: 1000 dpi Number of buttons: 3 Scroll wheel: Yes Mechanical Scroll Buttons: Middle Button Unifying ready mouse: No Unifying ready receiver: No Battery life Mouse: 18 months Battery type mouse: 1xAA Battery life Keyboard: 36 months Battery type keyboard: 2xAAA Wireless operating distance: 10 m 4 Wireless technology: Logitech Nano Receiver Keyboard: Yes 2 AAA batteries (pre installed): Yes Mouse: Yes 1 AA battery (pre installed): Yes USB receiver: Yes User documentation: Yes