Description: The self-generating bicycle light requires no batteries which makes it perfect for long night rides. It allows pedestrians and vehicles to notice you even in heavy rain or fog. With the gentle rotation of the adjustment knob, you can adjust the angle. Specification: Lamp beads: head high-brightness lamp beads Charging: No need to charge Battery life: Your physical strength determines battery life Fork range: 1.6-2.2cm/0.63-0.87 inches suitable for most models Waterproof level: IP6 Installation location: Left side of bicycle Material: plastic colour: Black Package Contents: 1 x Bike Tail Light Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.