Ultra Bright， Fully submersible in water; Can be placed under water and will last up to 48 hours; Easy to turn on: simply remove the plastic tab and screw tight; Great for illuminating wedding or party centre pieces; Simply place in the bottom of a vase facing upwards and it will illuminate the entire vase enhancing the water and stems; Not just for under water use， you can choose to use them as a decorative light any where you like. Power resource: 2 x CR2032 batteries; Light color: Blue Dimension: 3cm(DIA) x 1.5cm(H). Packageincludin: 12x Led lights