Finger Pulse Oximeter and Heart Rate Monitor- Portable Blood Oxygen Level and Heart Rate Fingertip Sensor with Carrying Case and Lanyard by Bluestone EASY TO USE- One button operation makes this oximeter simple to operate. There is a big, bright OLED display that is easy to read. Simply place the monitor over your finger to take measurements. MEASURE BLOOD O2 LEVELS & HEART RATE- Keep track of your blood oxygen levels and heart rate the easy way! All it takes is the press of a button and the lifting of a finger to get accurate readings on blood O2 levels and heart rate. PORTABLE- Under 3 inches on longest side, this fingertip heart rate sensor will fit in your pocket! With the included protective carrying case and lanyard, you can always have your monitor with you on the go! GREAT FOR HEALTH ENTHUSIASTS- Measure your heart rate or oxygen levels after a run or workout to make sure you dont over work yourself and stay safe! PRODUCT DETAILS- Dimensions- 1.5 inches (L) x 1.3 inches (W) x 2.5 inches (H). Includes- Protective case and lanyard. Requires 2 AAA batteries (not included).