Compact and Long Battery LifeOxygen saturation finger monitor is light weight, easy to carry, and accommodates wide range of finger sizes. 40 hours battery life and automatic power off in 8 seconds.Plethysmography WaveformThe SpO2 Waveform measures the change in the volume of arterial blood with each pulse beat which helps determine the optimal time to take a reading.Accurate and Reliable Pulse Oximeter accurately determine your SpO2 (blood oxygen saturation levels) and pulse rate and strength in 4 directions, 6 display modes, and 10 levels of adjustable brightness.Sport EnthusiastsThis device is for Sports and Aviation use only and not intended for medical use. It's great for mountain climbers, bikers, trainers, skiers, aviators, and general sport enthusiasts to spot check SpO2 on the fly.Out of Box ReadyOur portable oxygen saturation machine comes with Instruction manual, 2 AAA alkaline batteries, Neck lanyard (detachable and adjustable length) you'll be ready to use your portable oxygen sensor right out of the box.