I have a philips electronic stethoscope (model# M4530A) for sale. It is in perfect working condition! Below are some product specifications for the item. Asking $100 cash firm - similar models are retailing in excess of $300.00!

Product Features

Exceptional sound quality and clarity in the desired frequency ranges
Enhanced filtering circuitry reduces noise pick-up
Ergonomic chest piece is easy to hold and allows for quick, one finger access to the Power-On/Mode Selector button.
Adustable binaurals and ergonomically designed ear pieces comfortably fit any clinician and seal out external sounds.
Rugged, Durable construction.
Lightweight design, 145 grams (M4530A) and 165 grams (M4534A), including battery. Compact enough to fit in a pocket.
Four levels of sound amplification and two auscultation modes allow the clinician to select the desired frequency range with a push of a button, without interrupting auscultation.
Diaphragm mode (green LED) for mid-range frequencies and other low amplitude lung sounds.