Why risk back strain or injured feet when exchanging medical oxygen cylinders? The Quic-Release Cylinder Lift, Model QR-CL, raises and lowers "M" through "J" cylinders simply and easily, keeping them secure from before they're picked up until after they are secured in the ambulance. There is never a point where the cylinder is left unsecured, greatly reducing risk of injury. The unit operates off of a 12v battery. A charger is provided.