The Baseline Pulse Oximeter is an easy way to measure oxygen levels. It attaches to your finger and emits two wavelengths, making for comfortable and non-invasive use. This Baseline® finger pulse oximeter measures your blood oxygen level as well as your current pulse rate. It has a bright LED display with large digits so that you can easily read its results.The Baseline® oximeter is maintenance-free for your convenience. Its small size makes it easy to carry around with you, whether you're a health care worker, athlete or have respiratory issues. It's powered by two AAA batteries which are included. This portable oximeter also includes a lanyard so that you can easily attach it to your body.