1. Ultra-light and adjustable: This hands-free LED headlamp weighs only 45 grams, making it easy and convenient to carry. It is equipped with a breathable elastic headband that can be adjusted in angle by 60° and the length can be easily adjusted to perfectly fit your head circumference. It may be the most comfortable headlamp for both adults and children. 2. USB charging: This running headlamp uses built-in 800 mAh lithium polymer battery technology to meet your needs. According to our experience, after a single charge, it can stay idle for up to 12 hours and be used for up to 5 hours. It is compatible with all USB ports and can be fully charged in just 2 hours via a USB port (including the USB cable). The industry-leading LED beads have a service life of over 100,000 hours. 3. 5 modes and high - beam function: It is designed with 4 lighting modes (white light: 200 lumens for high brightness, 100 lumens for medium brightness, 50 lumens for low brightness, and SOS strobe). The maximum brightness can illuminate a road up to 100 meters long. In addition, thanks to the memory function, you can reuse the last used mode, avoiding the need to switch modes one by one, making it more convenient to use. 4. IPX4 - level waterproof: When engaging in any indoor or outdoor activities, using this powerful LED headlamp, heavy rain or splashing water will no longer be a problem. It is the best companion for walking the dog, camping, running, cycling, hiking, caving, mountaineering, and even for emergencies at home or work. 5. Reliable and durable quality: This USB headlamp is made of strong ABS material and can withstand strong impacts during outdoor activities or work. It is the perfect gift for family and friends.