Save your marketing campaign with a little help from this Light Up Floating Lifesaver Key Tag! Measuring 2 9/16" x 3/4", this red/white item is made of polystyrene and prevents keys from sinking in water. Once dropped into the water, sensors are triggered which light up, making locating keys in murky, dark waters a breeze. Each key tag includes a durable 1" split key ring that's perfect for any boat of or house keys.