This compact stethoscope is portable and easy to use. It features a 2.7" LCD screen which displays an ECG waveform, SpO2, pulse rate, heart rate and pulse waveform. The screen contrast is adjustable and an alarm alerts the user when the pulse rate and SpO2 exceed the limits. Operating on a power supply of one 3.7V lithium battery it has a low power consumption. The heart rate measuring range is 30 bpm to 300 bpm. The SpO2 measuring range is 35% to 100%. The pulse rate measuring range is 30 bpm to 250 bpm. The stethoscope has dimensions of 87 (L) x 63 (W) x 19 (H) mm.