Product size: 12cm * 3cm * 2cm [Features] 1. Use the wind power generated while driving, without wires, installation with adhesive paste 2. When the speed p / h reaches 40, the LED light will light up, like the daytime running light, which helps driving safety. 3. With stand, the angle can be adjusted, firm and worry-free. 4. One-piece design, small size and compact structure. 5. Selected 8 bright LEDs, environmental protection and energy saving, long working life;