These two lightweight plastic clamps with rubber on one edge feel very sexy to even wear alone. They do not pinch very tight, making them great for use on the most sensitive private areas. They can stimulate great pleasure if used correctly. The design makes it easy to use with or without other accessories. One set of two clamps works on one circuit. One clamp is the negative pole and the other positive. They are compatible with all Zeus Powerboxes. Please note: The manufacturer, makes no warning of use above the waist. Yet, XR, LLC advises not to use e-stim devices above the waist as dictated in most electro sex guides.