Thank you. Nice to meet you. USB Rechargeable LED Bicycle Taillight Waterproof 4 Modes Bike Cycling Rear Safety Warning Lamp Features: - The new high-quality bicycle lights, lamp beads for high brightness LED material - Rechargeable polymer lithium battery - Luminance: 15LM (low power consumption and durable service) - USB rechargeable bicycle taillight and auto cut off when fully charged. - O-ring strap suitable most bike cube(12-32mm) ---- Modes: Normally on/ Slow Flashing/ Flashing/ Strobe - Waterproof USB Rechargeable Flashing Night Rear Tail Flashlight Warning Cycling Bicycle - Great for student, baby stroller, jogging, walking, bicycles, car emergency, horse-riding, road emergency&camping, etc. - High quality internal lithium battery,only need about 2 hours to be fully charged while be used for about 12 hours. - Super waterproof,make you riding freely regardless of rain. - High brightness and energy saving LED. Specifications: Type: LED Mode: 4 modes Brightness: 15 lumens Item Color: Black LED Light: Red, Blue, White Fittings Color: Random Suitable Tube Diameter: 12-32mm/0.47-1.26" Mounting Placement: bicycle seat post Product Weight: 60g Product Size: 7.5 x 3 x 2cm/2.95 x 1.18 x 0.79" Package Weight: 100g Running time: Long bright: 4 Hours Slow flash: 10 Hours Shun flash: 12 Hours Strobe: 8 Hours Charging time: about 2 Hours Notes: 1. Since the tailight is new, there may be some low battery cases. Please charge it before use. If this brings you trouble, we deeply feel sorry. 2. There may be slight size deviations due to manual measurement, different measuring methods and tools. 3. The picture may not reflect the actual color of the item because of different photographing light, angle and display monitor.