More safety - super high brightness - this chest lamp works with high light intensity over a lighting distance of 25 meters to ensure that you can see potential obstacles or dangers; The USB charging light is waterproof, convenient, reliable and durable. Adjustable 90 degree angle - this running chest light is 90 degree adjustable to meet runners' requirements for uphill slope and downward. Latest rechargeable battery - this body light uses the latest 2000 ma rechargeable battery. The kit comes with a USB charger cable which can then be used to charge at any USB port. Full charge in 3 hours and use in low mode for more than 5 hours. There are three lighting modes - operation of the headlights with high, low and strobe lights up to 250 LM, offering flexibility and ability to extend battery life. Three switching modes are implemented. A red triangle on the back helps the driver see you and avoid accidents. Adjustable strap with elastic strap - racing chest light with flexible strap and adjustable length for a comfortable fit. Fully adjusted, just like the headlight straps, you can tighten and loosen them to suit your needs. Dimensions: head light size: 9*10*2.2CM / 3.5*3.9*0.9" (L*w*h) Backlight Dimensions: 7.1*11.7*11.7M / 1.7*4.6*0.8"(L*w*h) Package contains: 1 * Night Run Light, 1 * USB charging cable