The jump eggs using nontoxic polymer material， the surface fine grind arenaceous processing， smooth， exquisite， safe， durable， and easy to clean. Egg need 2 AAA battery (not include)， remote control has built in batteries. Comes with wireless remote control， safe， hygienic and comfortable to use. This compact sized personal massager comes in the shape of an egg and is controlled by an remote control. Comes with 20 different speeds and pulses so you can adjust the amount of pressure you want by using the buttons on the remote control. Waterproof design， can be used in the bath and swimming pool. Resembles an MP3， more subtle， put the bag， you do not fear discovery.