Very light, equipped with a flexible shoulder strap, adjustable in length, to ensure comfort of use. [Luminosity; adjustable]: The rechargeable LED panel is designed with 3 kinds of brightness, which can project up to 200 lumens in visible range of 20 meters, which can be adjusted according to different surrounding environments. At the same time, thedirection of the light can be freely rotated 120 degrees, allowing you to better understand the road conditions. [USB charging & waterproof]: the rechargeable front panel is equipped with a USB charging cable, which can be easily connected to a mobile power supply for charging. It takes around 3 hours to fully charge via the included micro USB cable, which isUSB based. on a powerful 2000 mAh rechargeable battery. They offer an IPX-65 waterproof feature, so you don't have to. worry about trouble when it's raining. [Adjustable Soft Shoulder Strap]: Equipped with seat belts; elastic and adjustable buckles, the straps can be tightened and loosened as needed to easily adjust the size. The headlamp at Rechargeable LED weighs only 160 grams, which is very light and willnot interfere with your exercise. Improved vertical directional beam with adjustable angle to meet the needs of uphill and downhill riders. [Safer]: Front white light reflective belt and rear red alert, with an added layer of protection, which not only lets you see oncoming vehicles, but also lets you see dangerous roads and trails.