Feature: 1. Waterproof material can work normally even in rain or humid fog. 2. Suitable for a variety of models, convenient and fashionable; 3. Adding two magnets to the original magnet is safer to rideWe only provide one magnet 4. No battery required, no need to charge, no switch button, only light when riding, continuous battery life; Specifications: Color: Black Lamp beads: bullet head highlight lamp beads Charging: no need to charge Material: high quality engineering plastic Net weight: 80g size: 55.5mm*35.5mm*28mm Battery life: your physical strength determines battery life Fork range: 16-22mm suitable for most models Waterproof rating: IPX-4 Installation location: left of bicycle Advanced optical system, both near and far City and field cycling through Continuous battery life, no need to charge or battery Package Included: 1pc of Bicycle Tail-LighWe only provide one magnet