Include 2 headlights and 2 taillights. USB RECHARGEABLE: Bike Headlight: 300lm, Taillight: 200lm, Battery: 300mah. Encased in each light a lithium battery, type-C interface for fast, convenient charging. Usually, bright (maximum brightness) can last 1.5-2h. EASY INSTALLATION: Simple handlebar mount. Quick-release, light weight stretchable, strong, durable, adjustable silicone mounting straps. Securely attaches to handlebar for bumpy terrains. Our lights fit around any size handlebars, seat posts, backpacks, and helmets and stretch to keep lights secure and firm. They can be easily loosened and fastened, so no tools are required. MULTIPLE BRIGHTNESS MODES: Bike Headlight: 4 modes (high, medium, low, strobe); Taillight: 6 modes (high, medium, low, strobe, slow flash, SOS). MULTI-PURPOSE: This bike light set is versatile enough for cycling, hiking, camping, or any outdoor activity and can use as an emergency flashlight. WATER RESISTANT DURABLE- Water-resistant bike light grants riding in poor weather conditions, like rain, fog, etc. Durable, made of high-quality casing, excellent impact resistance, and heat dissipation.