Cardonics E-Scope 7700 Clinical Amplified StethoscopeSlim, a lightweight electronic stethoscope that improves listening for medical personnel. Features Amplifies up to 30dB Slim, lightweight traditional design Automatic shut off: uses standard AAA batteries Automatic volume restart Frequency control allows the listener to concentrate on sounds within a specific frequency Includes ear tips and selection of bells and diaphragms Forms an acoustic sound seal for better performance Safe and effective product