A teaching stethoscope has 2 binaurals and one head so teacher and student can listen to the same sounds and the teacher can identify to the student what the sounds mean. This instrument is from Labtron (Lumiscope) and is a Closeout special. Not a Sprague-Rappaport design. It has a standard dual head: bell and diaphragm. You will hear the common sounds well with this. You might use this in a beginning program and not for critical diagnosis in a graduate study program. Available in black only. Comes in its own box. Made with latex-FREE tubing.