30-Pattern 5050 SMD LED RGB Colorful Bicycle Bike Cycling Wheel Spoke Light - Black (1 x AAA)
Manual switch (press to enter the sensor mode once senses vibration the light will turns on; Press to turn off.); 7 LEDs on each side total 14 LEDs; Will display beautiful full pattern when the speed is about 20km/h; Energy saving and water resistant; High-quality and convenient to use.