Qucikly and securely attached to heel of your shoe. Super lightweight so you don't feel a thing. Multi-settings for high visibility and added safety. Clip it on your wrist, sneaker, mountain bike etc. It can glow and flash, improve personal dafety when doing sports at night. Three modes: on, flash, off. Suitable for outdoor sports at night, such as running, climbing, cycling etc. Also work as great gift for sports lover at night.