The Erogenator has been specifically designed to uniquely massage the nerve endings on your scalp and neck, causing an amazing feeling which can be felt in zones all over your body. The Erogenator is made up of 5 pieces of copper, halved and threaded through a turned aluminium handle, creating 10 feelers. Each feeler has a loop in it. This is for two reasons. Firstly it's function is to enable easy opening and closing of the Massager. Secondly, and even more importantly, it functions in a 'spring-like' fashion thus holding the tension and shape. The handle has been designed and engineered with great care, ensuring the weight and shape will maximise results when using the Erogenator. Because the feelers come into direct contact with the head, we have used copper as the primary material as it is said to have great healing qualities. Therefore not only does it feel fantastic, it is very good for you too, and can relieve stress, tension, headaches and other minor ailments. The tips of the Erogenator have been dipped in a resin and rounded, so as not to harm you in any way. The Erogenator can be easily adjusted to fit any head size, see user guide for details. The Erogenator has no battery. The tingly feeling you get when using it comes from the tension of the copper wire around your head gently stimulating the nerve endings on your scalp and neck area.