These assorted reflective safety strobe lights have a clip on the back to wear on clothes. Great for Biking, Walking., Jogging, Boating, Hiking, Camping or any other outdoor activities. Includes batteries (2) AG13 Button Cells. Each piece measures 1 7/8″ x 1 7/8″ x 5/8″ and features an on/off button on the back. Comes in assorted colors but can not guarantee which color or colors you will receive.