Features: brand new and high quality High Quality materials: Made of premium engineering plastics, it is professional and durable. Simple Installation- The taillight strap fits most handlebars and seatposts. And it is for mountain road bikes. Magnetic Induction Power Generation: magnetic induction power generation,no battery, no need to charge, self-powered. Excellent Safety: The IPX4 waterproof bike rear light can be used in rainy days. That provide super bright red light, make your ride safer. Buy with Confidence: If you have any questions, don'for t hesitate to contact us, and we will try to serve for you until you are satisfied. Specifications: Material:Plastic Waterproof: Ipx4 Note: Please allow 0-1cm error due to manual measurement. Make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1x Bike Tail Light.