You just blow them up, turn them on, and place them around a room to create your own special room mood lighting effects. They morph through an ongoing red, green, blue colour changing pattern. They can be used as a mood light, for a party, as a kids night light indoors or out. Despite the fact they are inflatable; please resist the temptation to place your blow lite in a pool as they are definitely NOT waterproof (unless you want to be purchasing replacements). Batteries are included and will last for around 48 hours and can easily be replaced. 3 x LR44 button Cell Batteries included Size 18 x 14 x 14cm