Features:
Solar powered
Waterproof
Built-in rechargeable battery
The use of high-intensity, high light transmittance of special tempered glass and high performance solar ultraviolet radiation-resistant TPT EVA sealing material, laminated together by professional equipment .
Theres no need to worry about running out of batteries just 2 hours of charge in the sunshine will give you 4 hours of constant light and 8 hours in flash mode.
Add an environmentally-friendly glow to your bike with this solar powered, clamp-on LED tail light which has 3 modes: quick flash, flash and constant.

Specifications:
Mounting Placement: Seatpost
Appearance color: Black + Red
Light Color: Red Light
Light bulb:2 LED
switch: press style switch
Battery: no batteries, solar-type
Cassette skin Diameter:22-30mm
tail light size: length 66mm * width 55mm*
4 Modes: Quick flash / Slow flash / On / Off.