The OhMiBod Naughtibod is designed to work with your iPod, iPhone, portable music player or any other audio source with a 3.5mm jack. When hooked up to an audio device the strength of the vibrations is dictated by the music that you are listening to. The OhMiBod Naughtibod may be small in size at only 5 1/2″ long (4″ insertable) and 1 1/8″ in diameter (at its widest point) but don’t let that fool you. You can also use your Naughtibod without your iPod, without music you can choose from seven different speeds. The OhMiBod Naughtibod is modled with premium grade hypoallergenic non-toxic, non porous ABS plastic with a velvety smooth PU coating. With the OhMiBod Naughtibod you will never listen to your music the same way again!