It is adjustable Luminous Arm Band, easy to wear for adults or kids, men or women, pets with a loose or snug fit. Easy to wear, just need to simply slap it to the position you like, such as wrist, ankle, and arms. The LED is bright at night, High visibility to protect you safety, Designed to give you 360 degree ultra-high visibility in dusk and night time activities, E.g night running, jogging, dog walking, camping, cycling, motorcycling, dog walking, concert, camping activities for kids, pet belt, kids safety walking at night etc outdoor sports.