This stethoscope has electronic sensor and three Stethoscope modes with Heart 20-230Hz, Lung 100-800Hz and H&L 20?800Hz. Its measuring range of heart Rate, SpO2 and pulse rate vary from 30bpm-300bpm, 35%-100% and 30bpm-250bpm respectively with accuracy ±2 bpm or ±2%(select larger), 70%-100% ,±2% <70% unspecified and ±2 bpm or ±2%(select larger) respectively. This ergonomic, portable and compact device displays ECG waveform, pulse waveform, heart rate, and SpO2 and pulse rate. It has earphone output and 16 adjustable steps volume. Besides having Alarm for SpO2 and pulse rate exceeding limits, it offers real-time detection, TF card data record and review. The data recorded is transferred to a PC with PC analysis software. With ONE 3.7 V lithium battery, it consumes less power. Its color LCD screen is 2.4". Its dimension is 110mm (L) × 60mm (W) × 14mm (H).