Lighting can change the atmosphere of any event or celebration. Add these bright submersible battery operated lights to a center piece, vase, water feature, ice bucket, sculptures and flower arrangements. They are perfect for illuminating Luminaries and other seasonal or special occasion decor. Each Light uses two CR2032 coin size lithium batteries (included) for hours of use. The size is 1.25" diameter by 1" high. The base is a screw on and off switch. The LED light will last for 5000 hours and work under water.