Whether you're a duck on a lake or frog in the pond, these waterproof light sticks won't make you yawn. You can hold them in your hand, or put them round your neck. Take a dip in the water for a glowing effect! To activate your Light Stick, press the button on the bottom of the stick. Set your safety wand on a quick blink or a steady light. NOTE: Before using your light sticks in or around water, check that the battery house is screwed on TIGHT. Optional lanyard is breakaway safe. Dimensions: Height: 6.50 in. Width: .75 in. Lanyard Length:32 LED Colors: Green Comes ready to use with 3 AG13 Batteries; sorry, not replaceable.