Features: -This product applies to all models cars -New LED technology anti-collision lights,build in high-tech component sensor, long service life -When the door is opened, it flashes rapidly, warning the rear to avoid the accident occurred -No external wire, just paste on to your car door easily -First 6 seconds "rapid flash" mode, best warning to the rear of the car. After 180 seconds lighting, it will be off automatically. Specification: Product Name: car door collision warning lamp Power: 3V Battery: CR2032 Button Battery ( Include) Light Source: LED Quantity of LED Bead: 5pcs Emitting Color: Red, Yellow, Blue, RGB Material: ABS, magnet, LED Size: About 28mm x 9mm (D*H) Package Included: 2pcs LED Warning Lights / 4pcs LED Strobe Lights