The Matias Wireless Aluminum Keyboard is a slim, aluminum, wireless (Bluetooth) keyboard with a similar layout to the familiar Apple Wireless Keyboard. It has three features that enhance your experience compared to the regular Apple Wireless Keyboard: 1. It has a numeric keypad, 2. It has a rechargeable battery with a typical battery life of 1 year before needing charging, 3. It has the ability to pair to four Bluetooth devices at the same time, and easily switch between the four devices with the press of a button. Now you can use the same beautiful, great-feeling keyboard for your Mac, iPad, iPhone, Android, or PC; the keyboard even pairs with the optimal layout for each type of device, so when you switch between devices, the keyboard layout is what you expect.