Visual Electronic Stethoscope Features ?Portable and convenient to operate ?based on latest piezo sensor technology ?Powerful electronics amplify the sound up to a maximum of 32 times ?16 steps programmable volume settings ?Sound model: Heart, Lung, Heart and Lung ?Frequency Response: 20Hz - 20,000Hz ?Real-time record and display the heart rate and ECG ?Profesional spo2 dispaly with adult and neonatle probe(option) ?TFT color LCD display (65536 color): 160*128 pixels ?Accommodates infant, pediatric, and adult patients ?4.2V Rechargeble Lithium battery ?Automatic switch off after 3 minutes from last button activation