Ergonomic Chest Piece The symmetrical design of the chest piece is comfortable and accommodates right and left handedness. LED Display Visible under all lighting conditions. Long battery life Warning light indicates low battery. Auto shut-off conserves battery life. The lithium battery lasts 1 year. Auto-impact Muting Auto-impact muting protects the ears from accidental high intensity noises. Dual Frequency Modes The diaphragm mode boosts the volume of mid-range frequencies and low amplitude pulmonary sounds (100-360 Hz). The bell mode amplifies low frequency cardiac sounds (45-230 Hz). |