The Apple Wireless Keyboard is a keyboard included with new iMacs that uses Bluetooth to connect wirelessly. Because it's wireless, it's easy to move around and type away from your computer and works with any device that supports Bluetooth wireless technology. To connect the Wireless Keyboard to a computer or tablet, you need to first set it is discoverable mode for the computer to identify the device. Discoverable mode means that other Bluetooth devices can detect, pair or connect to the keyboard.
Switching an Apple Wireless Keyboard to discoverable mode
Press the "On/Off" switch on the wireless keyboard to turn it off. This switch is located on the right side of the keyboard stand and is marked with an on/off symbol.
Unpair the keyboard from the device it's currently paired with. By default, the keyboard will be paired with the Mac it came with. On the Mac, click the "Apple" menu, then "System Preferences." Click "Bluetooth," select "Apple Wireless Keyboard" on the left-hand pane, and click the "-" symbol underneath it to unpair it.
Press the "On/Off" switch on the keyboard again to put it into discoverable mode. The green LED will begin blinking to show that the keyboard is discoverable. If the keyboard is not paired with a computer or other device within three minutes, it will turn off again to converse battery life and you must press the "On/Off" switch again to put it back into discoverable mode.
The Apple Wireless Keyboard requires two AA batteries to function.