Using dual-beam infrared to communicate with your PDA wirelessly, the keyboard no longer has to be attached to your PDA. Since the operation of the keyboard is based on the universal infrared technology, the keyboard is compatible with many Pocket PC and Palm devices available in the market. It can also be compatible with future PDA devices through driver updates. The Universal IR Wireless PDA Keyboard may be the last PDA keyboard you need to buy. Runs on a single AAA battery.