Medical Disclaimer We receive medical equipment from various medical facilities. We do a basic power on test of each unit where possible. We are not trained or licensed to do full testing of medical equipment. We cannot guarantee full functionality or safety of a device. This item is meant for resale to companies or individuals that have the ability to fully test before use. Penlon Pressure failure Alarm for Intermittent pressure ventilation in hard case. None of the items are for clinical use, except after testing and certification by competant authority.