Sets a new standard in accuracy and features. Simple to use: just place the oximeter over the fingertip and touch a button. The oximeter lights a new, high-tech display known as an "organic" LED, which results in smooth numbers and readouts-no dashes or dots to form numbers. The true display illuminates in the dark yet is clearly visible in bright light. It uses less battery power, and quickly provides you with real-time info on heart rate and blood-oxygen saturation levels. When the finger is removed, the oximeter automatically turns itself off after six seconds. Requires two AAA batteries.