【Brand New】 Reflective Wristband with LED Battery - CR2032 x 1 included (for testing) How to use: Press the button with the circle mark on the main unit to make the white LED flash or light up. Highly reflective material reflects car lights to alert drivers of your presence. For preventing traffic accidents during nighttime and early morning jogging, walking, cycling, and for children going to cram school. - Length 35cm, Width 4cm #ReflectiveCatchBand #SnapReflector #TrafficSafety #Wristband