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. 3 LIGHTING MODES：Wide-angle. 300Lumen Max. (5500K-6000K) by 3 LEDs.3 lighting modes:Normal(HI) Power saving(LOW),Flash(SOS),Built-in 1260 MA lithium battery and USB charging: high light: 1.5 hours ; low light : 4 hours; flash: 6 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 5 LEDs Red warning flash lights,can be protect your security.