Features: Non-thermal radiation, safe and stable, reliable Anti-reflective aluminum alloy coating makes it durable for long-term use A strap is given for convenient carrying Featured with variable focus and waterproof performance Perfect suitable for household, outdoor activities, hiking, night fishing, camping Specifications: LED Quantity: 5pcs Dimension: approx 7.5*3*2cm Mounting Placement: bicycle seat post Suitable Tube Diameter: 12-32mm Click the flash, press the second burst flash, press the three long light The charging time of about 2 hours,Long bright 3 hours Package Includes: 1pc x LED Bike Tail Light 1pc x USB Charging Cable 2pcsx rubber band