Finger Pulse Oximeter for Blood Oxygen Saturation Monitor - Portable SpO2 & Heart Rate Monitor with PI Sleep Tracking - Ideal for Athletes, Pilots, Sleep Apnea & COVID-19 Patients (Includes Batteries & Lanyard) - Silver & Black

Works greatWas working fine the first set of batteries, when I replaced them now it won't turn on, These are new batteries, so no its is not the batteries are old, even replaced them with more new ones and still doesn't turn on. Very disappointed with this item.