Security level upgradedSay goodbye to the usual sports reflective vest,this led reflective vest is equipped with 360 degree visibility reflective strip,which can make you visible from 900 feet away. Bright colors are also more alerts.These running lightsgreatly improve the safety of your night workouts. 3 light modes & 8 ledsThis running reflective vest adopts 4 LED lights in the front and in the back, making sure you can have a much brighter environment when you run. The 3 modes are respectively: quick flash, slow flash and continues lighting,you can switch modes according to your preferences.. Breathable and lightweightThis running lights for runners are made of high-quality and skin-friendly breathable materials, weighs 0.31LB, it can be used in any season without adding any burden to your sports. Suitable for running, cycling, dog walking,night safety protection, jogging and other night outdoor activities. One size fits allHigh quality elastic strip equiped with adjustable buckles is adjustable and with good strength, so the running light also wears comfortable. the range of adjustmnets for waist band circumference is 20 - 35.4 inch. Both children and adults can use it, no need to worry about your body shape. Colour:Blue Length: 26-37 inch/ 67-94cm Waist circumference: 21.5-37.5 inch/ 55-95cm Material: Elastic reflective band Reflection distance: 985 feet away Button Battery: 2pcs CR2032 + extra 2 batteries Rechargeable Battery: Rechargeable lithium-ion batteries