Wireless Keyboard & Mouse Logitech MK345, Spill-resist, Palm rest, FN key, 2xAAA/1xAA, Black . Battery life: 48 months Battery: 2-AAA On/Off switch: Yes Full-size layout with 12 enhanced F-keys for media control: Unifying-ready keyboard: No Unifying-ready receiver: No Wireless operating distance: 10 m maximum Wireless system: Advanced 2.4 GHz wireless connectivity Sensor technology: Logitech Advanced Optical Tracking Resolution: 1000 dpi Battery life: 18 months Battery: 1-AA On/Off switch: Yes Number of buttons: 3 Scroll Wheel: Yes Tilt function: No Unifying-ready mouse: No Unifying-ready receiver: No Wireless operating distance: 10 m maximum Wireless system: Advanced 2.4 GHz wireless connectivity Connection Interface: USB receiver https://www.logitech.com/en-hk/product/wireless-combo-mk345