InvoSpa’s oxygen saturation monitor will determine your SpO2, Pulse Rate and Pulse Strength results in 10 seconds or less displayed on its large digital LED screen. This oxygen monitor fingertip is suitable for mountain climbers, skiers, bikers, aviators or anyone interested in measuring their SpO2 and pulse rate while on the move. This device is for Sports & Aviation use only and is not a medical device. This oximeter finger with pulse is weighing only 50 grams, and comes with a lanyard so its easy carried on its own or inside your gym bag or backpack. Attach the included lanyard to the case or directly to the oximeter for easy reach anytime. Fingertip Pulse Oximeter device, 2 AAA Batteries, User manual & a Lanyard for your convenience. Equipped with two AAA batteries, the finger pulse oximeter fingertip automatically powers off when not in use and delivers up to 24 continuous hours of battery life.