Double Sided 16 LED Colorful Mountain Bike Spoke Warning Lights Bicycle Wheel Light Tire Signal Reflective Lamp Bike Accessories Description: The product is consist of 16pcs colorful leds It can flash 30 different kinds of patterns,patterns will be changed every 4second Pattern is clear and completely when speed up to 20Kms/hour Conversion function of automatic mode and bright mode Mode: Automatic mode: It is only working at night and motion Bright mode: It is working at any time except "Turn Off" Operation: Longer pressing button about 2 seconds to turn on or turn off the light, light first enter into the automatic mode while it is turned on with the 13st-16th led's flashing,then can be changed to the manual mode by just short clicking the button with 1th-4th led's flashing. Battery: Operated by 3 x AAA batteries (Not included) Could be maximed to 10 hours when it work Size:16.5*3.8*1.5CM Specifications: The product is consist of 16pcs colorful leds It can flash 30 different kinds of patterns,patterns will be changed every 4second Pattern is clear and completely when speed up to 20Kms/hour Conversion function of automatic mode and bright mode Package Included: 1*Bike Wheel Light Notes: Due to the difference between different monitors, the pictures may not reflect the actual color of the item. Compare the detail sizes with yours, please allow 1-3cm error, due to manual measurement. Please leaving a message before you give the bad feedback, if the products have some problems. Thanks for your understandings.