Fangrui Product Details Bicycle Taillight Multi Lighting Modes Usb Charging Led Mtb Road Bike Flash Tail Rear Light For Cycling Seatpost Warning Lamps -usb Charging -ipx2 Waterproof -shell Material: Waterproof Abs -charging Time: About 2 Hours -working Time: 3-6 Hours According To Different Using Mode -easy To Install, Suitable For Many Sizes Of Handlebars Or Seatpost -5 Lighting Modes Style: Strong Light, Weak Light, Flashing, Warning Lights, Lighting(as Working Video Showing) How To Use Open: Click 1 Time (0.5 Second) Close: 5 Lighting Modes Style Need Press 3 Seconds. 4 Lighting Modes Style Need Press 1 Second. 750-ps - 0080203 Wholesalers And Retailers Are Welcomed. For Wholesale,we Will Offer Discount Or Free Shipping Method Which Only Takes Short Time To Arrive. If You Are A Retailer And Wanna Make Your Own Business, We Could Send The Goods To Your Customers Directly And Wont Leave Any Information About Us If Youd Like To. What Should I If I Dont Receive My Item Please Contact Us First, We Will Track Your Item.