Inductive switch, it lights when the door is opened, and goes off when the door is closed.6 high-brightness LED lamp beads, when temporarily parking and opening the door, it can effectively warn vehicles and pedestrians behind.Alternate flashing, stronger warning.Simple and compact, does not affect the opening and closing of the door, and is suitable for various car models.The waterproof design effectively protects the inner main control board from rain erosion.Built-in battery, lasting battery life, can be used for two years.Use 3M non-marking glue to install, stick firmly, convenient and fast.Product Name: Auto-sensing warning light for car door collision avoidanceMaterial: ABS+PCColour: BlackSize: 52.5*0.8cmSpecification: 2Installation location: left and right doorsWorking mode: open the door and turn on the lights automatically