Feature: 1. Adopt advanced technology to realize continuous, rapid and accurate monitoring of human arterial blood oxygen saturation and pulse rate. 2. Alarm indication, when the user's measured value exceeds the normal value, the value on the screen will flash alarm to warn the user. 3. Optical frequency blood oxygen digital conversion technology, under the interference of light (including natural light and artificial light source), the value can still be accurately measured, without affecting the normal use of users. 4. Short press the setting key, the display direction can be switched in both directions, which is convenient for reading. 5. Suitable for middle‑aged and elderly people, oxygen therapy crowd, third trimester people, hospital patients. Specification: Condition: 100% Brand New 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 to Use: 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.. Package List: 1 x Oximeter