Stemming from a unique handheld control pack the range of stimulation is impressive, you\'ll be able to vary the pulses from fast to slow, and also the intensity of the shocks from a gentle tingle to a sharp, throbbing tap. As a fantastic bonus, the control pack itself doubles as a handheld massager that can be used anywhere on the body, the oval centerpiece acts as a ground, so that any other part of the metal top that touches skin will transfer the shock. As with any electro toy, the Cage should not be used by pregnant women, people with heart conditions and pacemakers, or anyone with health issues. Do not use while driving or operating machinery. Requires a 3V battery, which is not included.