The PureLight Reusable Ear Clip Sensor for Nonin Oximeters is used on the ear lobe and is a great alternative to finger sensors. It is used for patients that weight over 88 lbs., for stress testing and continuous monitoring. The Ear Clip Sensor comes with a 3-foot cord. It is made in the USA and has a 90 day warranty. It is compatible with Nonin 8500, 2500, 9840, 9600, 9700, 2120, 7500, and Lifesense Oximeters.