It is a belt made of a soft cotton laminate that fits comfortably around a patient's waist. It comes with a strap that is permanently fastened on one end to the belt while the other end of the strap is fitted with a small (hook & loop) hook. The vent circuit is secured to the belt by laying the circuit onto the belt and then placing the strap over the circuit and attaching the "hook"end of the strap to the belt.