Featuresr superior led chips and beads emit 3 kinds of lighting colors blue white and red lightr 4 leds with 7 lighting modes bring amazing diverse lighting effect and experiencer ultra brightness up to 150 lumens enhances cycling safety at nightr built in 900mah rechargeable battery only takes 25 hours to full charge by any device with usb portr smart heat dissipation function ensures longer life spanr easily install on most bicycles suitable for 222 316mm tube diameterr sturdy