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There's a battery cover release button located at the bottom of the mouse. Since the Logitech Wireless Desktop MK320 is created more to be used with a laptop than a desktop computer, the mouse doesn't have the page front and back buttons. The wireless keyboard/mouse combo touts battery life of 15 months and 5 months for the keyboard and mouse, respectively. However, the battery life can vary based on the use of the keyboard and mouse, and it is difficult to say how well the batteries that come with the Logitech Wireless Desktop MK320 will last. The mouse has a battery life indicator, but the keyboard doesn't. This combo is designed especially for laptop fans, but will function equally well with desktop computers. An inexpensive price tag plus its high quality and performance makes the Desktop MK320 by Logitech a superb all around value for your buck. The new Desktop MK320 by Logitech comes with a wireless, ergonomically designed keyboard and a wireless mouse, the ideal solution if you wish to go cordless. The package comes with a travel-ready wireless mouse and a standard sized keyboard, both featuring a solid wireless connection. Installing the mouse and keyboard is a snap. It's tougher to take the mouse and keyboard out of the box than to hook them up. Logitech Wireless Desktop MK320 works with Windows-based personal computers, Windows XP, Windows Vista, or Windows 7, and both devices should be easily recognized by the system as soon as they are plugged in. Just plug and play – no lag time or other installation troubles. tablet pc