Maico Stethetron electronic stethoscope, model number 3684. The apparatus is housed in a black leather case measuring 28.5 x 13 x 8 cm. A leather strap handle is affixed to one end of the case. The interior is fitted with one small, green velvet-lined compartment for the microphone. The instrument is comprised of: 1) binaural stethoscope ear pieces (metal with rubber tubing), 2) microphone with electrical cord, and 3) the stethetron unit, with adjustment knobs and carrying handle. A printed instruction booklet entitled "Maico Stethetron: A Guide to Accurate Auscultation" is also included.