oenbopo Colorful 14 LED Motorcycle Cycling Bicycle Bike Wheel Signal Tire Spoke Light Lamp 30 Changes Waterproof Note: the battery are not included in ! And this price just for one pcs price ,so suggest buy two pcs together for two bicycle wheel at one time! And there is no on and of button ,since this light will can flash automatically upon your install the battery into it . The product is consist of 14 pcs colorful LEDs.&lt;/p&gt; &lt;p&gt;It can flash 30 different patterns,and the patterns will be changed every 4 seconds. &gt;Patterns is clear and completely when speed up to 20kms/hr Equipped with light sensor and movement sensor,flash only at night and action