Features for Fingertip Pulse Oximeter: <br /><br />- Ergonomic design、 special for children<br />- Comfortable for wearing<br />- Measure SpO2 and PR accurately<br />- LCD display SpO2 and PR、 Pulse waveform and bargraph display<br />- Alarm function: Detected data going beyond limit alarm (when the SpO2 is below 90%、or the pulse rate is not between 50bpm and 120bpm、 the alarm occurs); Low power alarm<br />- Rechargeable button lithium battery<br />- High brightness can be used even in dark night<br />- Four viewing angles and six display modes<br />- Four levels adjustable brightness<br />- Low battery voltage indicator<br />- Automatic power off when signal is not available for 4 seconds<br />- Mini size、 light weight、 convenient to carry