The Mystim Tension Lover is an electro-stimulation unit that can deliver sensations ranging from a soft prickle to a sensuous pushing. It has two individually adjustable channels and seven different programs. With two individually adjustable channels, it allows for us to two toys to be connected at the same time. It comes in a solid plastic suitcase and can be purchased with a set of four self-adhesive electrodes or four permanent electrodes. It uses a 9 volt battery.