Quality Bike Set: Include bike Headlight and Taillight, 2 USB charging cables, The bike lights are rated at IPX5 water-resistant. Large battery capacity working for 4-8 hours. Advanced Design: USB rechargeable front and backlights, built-in 2000mAh rechargeable lithium battery for Headlight, and built-in 330mAh rechargeable lithium battery for Taillight. Easy Installation: The Headlight is equipped with a mounting bracket that can be easily fixed to the handlebar. Both Headlight and Taillight can be easily loosened and fasten, and no tools are required. The headlight holder is equipped with a screw that can be handled manually and Taillight is designed with four openings that tightly fit around most size seat posts. Multipurpose: The bike light set is versatile enough for cycling, hiking, mountain camping, fishing, or any outdoor activity and can be used as an emergency flashlight. This is great for cycling at night or in places where visibility and safe. Product Guarantee30 days guara