Description: Built-in battery, USB charging, power capacity and charging indication, 4 switch : fully bright, half bright, slow flashing, fast flashing. High-capacity rechargeable battery with an extra-long run time, built T6 battery, 2000mah, max output 380lm. Easy installation: The headlights are equipped with mounting brackets, which can be easily fixed on the handlebars without tools. The silicone mounting straps for the headlights and taillights have four openings designed to fit snugly with most size seat posts. Multifunctional: Suitable for cycling, hiking, camping or any outdoor activities, and can be used as an emergency flashlight. Specification: Material: ABS Plastic. Waterproof: XP4. Size Chart: Headlight: 11x4x2.8cm/4.33x1.57x1.1inch, Taillight: 7x2x1.8cm/2.76x0.79x0.71inch. Package Includes: 1 Piece Bike Headlight or 1 Piece Bike Headlight+1 Piece Bike Taillight(as you choose) Note: Color might be slightly different due to the color calibration of each individual monitor. Please allow slightly measuring deviation due to manual measurement. Customer satisfaction is our primary concern. If the product is somehow cracked or broken during shipping, please feel free to contact us. We will try our best to give you a satisfactory solution.