Description:100% and high quality The product is consist of 16pcs colorful leds It can flash 30 different kinds of patternspatterns 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 flashingthen 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*1.5CMSpecifications:The product is consist of 16pcs colorful leds It can flash 30 different kinds of patternspatterns will be changed every 4second Pattern is clear and completely when speed up to 20Kms/hour Conversion function of automatic mode and bright modePackage Included:1*Bike Wheel LightNotes: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 probl. Thanks for your understandings. Certification:none Origin:Mainland China Model Number:Double Sided 16 LED Light Mounting Placement:Wheel Spokes Power Supply:Battery Power Supply::Battery Battery Type:3 x AAA batteries Endurance:Could be maximed to 10 hours when it work Lighting modes:30 different kinds Support:Dropshipping/Wholesale