Get some blinking rings. Get them on the double. It will be no trouble wearing rings shaped like a bubble. You should take some home. Get some this very hour. Just squeeze this flashing foam to start the rings battery power. Height: 2.0 in. , 5.08 cm. Width: 1.25 in. , 3.17 cm. Ring Colors: Blue, Clear, Green LED Colors: 1 Blue, 1 Red, 1 Yellow Batteries: Batteries are NOT replaceable.