Large Easy to Read LED Display. Measuring range for SPO2: 35-99% and Pulse Rate of 30-254 BPM PR display mode bar-graph display, Low power indicator, and string tether (included), Battery requirements Two AAA 1.5V Alkaline Battery (included) Resolution: å±1% for SPO2 and å±1BPM for Pulse Rate, Measurement accuracy: SpO2: 80%--99%, å±2%; 70%--80%, å±3%; =70%, no definition. PR: 30--235 BPM, å±2% or 2 BPM, Automatic power off: When no finger in the device for 8 seconds, it will power off automatically to save battery life. 2099059
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