Hook+ Switch Interface
Hook+ is an Apple MFi approved switch interface that provides a reliable wired connection to the iPad, iPhone, or iPod touch via the Lightning connector. To get started, simply connect one to four switches to Hook+, turn Switch Control on, and connect Hook+ to your iDevice.
Hook+ utilizes the Apple auto switch configurator and the first time Hook+ is used with an iDevice it will automatically configure the iDevice to use single switch auto scanning or dual switch step scanning based on how many switches are connected to Hook+. Once initially configured, switches can be manually re-configured to meet the needs of the user. The Apple auto switch configurator is only available on Apple MFi approved switch interfaces.
With iOS 9, you are able to program two unique commands per switch for a total of eight different switch commands.
More information: https://www.ablenetinc.com/hook-switch-interface