FarSight Wireless Keyboard and Mouse Combo, Ultra-Thin Wireless Keyboard, 2.4GHz Mouse and Keyboard, Long Battery Life, for Windows 10/8 / 7 / Vista/XP Reliable 2.4 GHz wireless connection: A tiny nano-receiver connects both the keyboard and mouse using just one USB port. Pencil-thin, sleek profile (0.23in thin) keyboard and 4.5 x 2.3 x 0.8 inches mouse combo. Low-profile, whisper-quiet keys ensure comfortable and smooth typing. Hot keys customized for Windows keep access to applications and media control in easy reach. DPI button easily adjusts the sensitivity of the mouse between 3 DPI levels (800/1000/1200). NOTE: The Nano-receiver can be found in the battery compartment of the keyboard/mouse.* Requires 4 AAA batteries (2 for each unit) , batteries NOT included.