Our convenient retractable lanyard gives you the freedom to go anywhere and have SpO2 readings at your fingertips. The attached clip makes it easy to attach to a belt, pocket or purse. The retractable reel means you can get a quick reading from your finger pulse oximeter anytime you need without worry of dropping or losing your oximeter. May also be used as name card badge holder for any industry. Great for nurses, maintenance, medical and office staff, airport FAA and TSA, security staff, police, military, government, teachers, students, custodians, factory workers, employees, etc.