2PCS Wireless Magnetic Car Door Opening Warning Light 5 LED Strobe Flashing Anti Rear-end Collision Safety Lamps Indicator Light 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. Specifications: Product Name: car door collision warning lamp Power: 5V CR2032 Button Battery(Not Include) Light Source: LED LED Qty: 5pcs Emitting Color: red, yellow, blue, rgb Material: ABS, magnet Size: about 28mm*10mm(D*H) Package include: 2X Warning lamp