Water Activated carbon sensors. Swims in all directions. 4 minutes sleep mode. Innovative under water speaker as it sings the Baby Shark Tune. AGE 18months +. Requires 3 x AAA Batteries which are included. PLEASE NOTE: As this item is an assortment we cannot guarantee a specific style, please let us choose on your behalf or state any preferences in the comments section of checkout and we will do our best.