This medium blood pressure cuff fits upper arms 9.4” to 14.6” and is only compatible with A&D Medical and LifeSource brand blood pressure monitors. The tapered fit is designed to snugly and comfortably fit around your arm. All LifeSource blood pressure cuffs are durable and come with a 2 year warranty. NEED HELP? Our dedicated customer service team can be reached at (888)726-9966, and they can answer any questions or concerns you might have regarding your device. ABOUT A&D MEDICAL: A&D Medical and LifeSource by A&D Medical are a doctor recommended brands of health monitoring devices designed to help patients and their families track and troubleshoot with their doctors, all from the comfort of their homes. The technology in the blood pressure monitors, activity monitors, scales, thermometers, and smart devices help make keeping track of your health easy. Bullets change to: Medium blood pressure cuff fits upper arm sizes 9.4" to 14.2", please measure your arm to ensure correct fit For use with LifeSource or A&D Upper Arm Blood Pressure Monitors Durable material with comfortable tapered fit 2 year warranty