Slow Flash : The cube lights will keep slow flash between different color (Red Green Blue) about 2-3 seconds. Liquid Sensor : The sensor is located at bottom of the fake ice cubes .Lights will lights up when drop in any liquid (water or champagne activated) . It will be light off when its dry. Safe: Led ice cube lights is made of food safe polystyrene plastic .It it safe with food or drinks. Warnning:1) It is decoration lights ,not a toys for kids ! 2)Single use products ONLY ! 3)Battery maybe corroded after 12hours used! If you have any questions, please feel free to contact us, we will serve you 24 hours a day Thanks Aaren.syi