ADC 657 Electronic Stethoscope

The 657 features:

Amplifies up to 16x (24db) over traditional acoustic scopes
Patented piezopolymer film contact microphone provides wider frequency response than acoustic mikes used in competing models
Three frequency modes:
Bell (15-200Hz) for cardiac sounds
Diaphragm (100-500Hz) for lung sounds
Extended Range (15-4000Hz)
16 level volume control
Holds last mode and volume setting for convenience
Auto-shut off after 3 minutes extends battery life
Battery warning LED signals when replacement needed
Binaurals fixed at 15º angle for snug aural fit
Specially constructed ADSOFT™ PVC eartips for the ultimate in wearing comfort and acoustic seal
Lightweight and compact – weighs under 6 oz., measures just 28”
Uses 3V Lithium battery (included)