IPad Keyboard Dock

The iPad Keyboard Dock is a keyboard accessory from Apple that attaches to early iPad models with a 30-pin dock connector.

Support
The dock also works with iPhones, including newer devices with Lightning connectors if an adapter is used. It also includes an additional 30-pin port for charging along with a headphone jack for external audio.

The physical keyboard eliminates the need for the built-in software touchscreen keyboard. It was criticized for only attaching in Portrait mode, and not landscape mode.