ATOTO IR Wireless Romote Steering wheel controller(updated since April,2017) is specially designed & programmed ONLY for ATOTO M4(M4171/M4172/M4271/M4272) series. It does not work with any other headunit on the market. With this controller kit, user can use it in vehicles that has no original steering wheel keys control to operate the headunit. There are 11 keys on the kit, they work as: Volume+/Volume-/Mute/Hang Up/Answer/Voice Command,and 5-keyboard operation(skip next/skip forward/Go back/Go to menu/EQ switch).Check product image to see the details of how 5-keyboard works. This ATOTO SWC kit could also assist driver to run system recovery in case ATOTO Headunit system crashes and drivers are not able to access "reset factory data" from system settings.