It clips to your zipper or can connect to any other buckle or loop as quick as a snap. It lights up bright in solid or blinking mode for Red, Green and Blue SpotLits while the Disc-O SpotLit morphs through seven colors. These are great for trick-or-treating, summer camping and any other occasion where you need to spot your little ones. They light up with an easy squeeze. Squeeze again on solid colors to make them blink.