This is an auto door lock connector for the early model NH10 Aqua. As shown in the photo, there is a white female connector on the left side of the hood lever. Simply plug this product into that connector, and the doors will automatically lock when the car starts moving. It was very convenient because I have small children, and the doors lock automatically when the car starts, preventing them from opening the doors on their own. There are currently no observed malfunctions, but this is a used item, so please understand that it is non-refundable and non-returnable. Thank you.