Square - Simple yet effective, ClingOnz (TM) are perfect for shining some light on your next promotion! These wearable buttons flash with multiple LED lights and feature a shiny epoxy coating. Just twist to turn them on and off. Designed with a butterfly clasp on the back that allows it to attach to any kind of clothing. Shapes available include the iconic Vegas sign, the American flag, and the Canadian flag! Comes with replaceable batteries.