Fingertip Pulse Oximeter Household Portable Blood Oxygen Saturation Pulse Rate Monitor Condition: Item Type: Fingertip Pulse Oximeter Material: ABS Battery: 2 x AAA Dry Batteries (Not Included) Pulse Rate Measurement Range: 30bpm~250bpm Blood Oxygen Range: 35%~100% Measurement Accuracy: ±2% or ±2bpm, whichever is greater Measurement Accuracy: 70%-100%, +2%; 50%-69%, ±3% How e: 1. Open the clamp, insert your finger into the rubber finger cot (it is best to fully extend your finger), and then loosen the clamp. 2. Wait 2 seconds, the oximeter will automatically turn on and start measurement. 3. The oximeter displays the measurement data. 4. After removing the finger, the oximeter will automatically shut down.