The top flap of the box contains the USB receiver. Compatibility: Chrome OS and Windows operate longer and have a longer battery life: The keyboard and mouse come with standard AA and AAA batteries. Keyboard and mouse combo: To enable comfortable working away from your computer, the Logitech MK270 Wireless keyboard and mouse combo comes with a full-size keyboard and a precision mouse. Simple storage: The MK270 comes with a plug-and-forget receiver that neatly fits inside your mouse to keep it safe. Hotkeys that can be programmed to increase productivity: Use the eight available hotkeys to program commonly used apps to launch automatically.