CLEARLY LIGHTS UP: The beam of the Run Light is perfect for lighting the first 25 metres in front of a runner, 8 metres wide, allowing them to see where they are putting their feet and to avoid obstacles, Let you all the way unimpeded from running light. 3 LIGHTING MODES：Wide-angle. 300Lumen Max. (5500K-6000K) by 3 LEDs.3 lighting modes:Normal(HI) Power saving(LOW),Flash(SOS),Built-in 2600 MA lithium battery and USB charging: high light: 3.5 hours ; low light : 7 hours; flash: 7 hours. Adjustable webbing with high elasticity allows you to adjust the size to suit your individual body, giving you a comfortable and pleasant feeling during the exercise.Back WARNING LIGHT DESIGN: it has 6 LEDs Red warning flash lights,can be protect your security. Perfect for shooting at night, running, walking, camping,Hiking, Riding a bicycle or other rayless environment,When LED lights is ON, please DON'T look straight. Multifunction night light,you can use it on the waterproof case of GoPro Hero13/12/11/10/9/8/7/6/5/5s and Hero4 Session/4/3+/3/2 Xiaoyi/ SJCAM. If you intend to buy one, why not buy two, one to send you dear. Everyone together to exercise, so that a healthy life to accompany your life.