Furthermore, this Bluetooth wireless keyboard operates on just two AA batteries and has a power management system that conserves battery life. So when you"re not using the keyboard, it automatically powers down. The instant you start typing, it turns back on. Use the on/off switch when you"re away from your computer for a long time. Apple MC184LL/A Wireless Keyboard: * Apple Wireless Keyboard * Two AA batteries * Printed documentation Minimum System Requirements:* iPad * Bluetooth-enabled Mac computer with Mac OS X v10.5.8 or later, Aluminum Keyboard Software Update 2, and existing keyboard and mouse for initial setup * Two AA batteries (included)