The 3M™ Littmann® Listen-In redefines the traditional limits of auscultation education by delivering a wireless, simultaneous sound experience for multiple clinicians. Reduces the length and increases the efficiency of teaching sessions Fewer interventions by students Presenting stethoscope can be easily switched to listening stethoscope, enabling teacher to listen to student Digital capture ensures perfect sound reproduction between one presenting stethoscope and up to four listening stethoscopes Improves the confidence of both educator and trainee, as there is certainty of the sounds that are being observed Connects to all five Littmann Model 3200 stethoscopes within seconds Presenting stethoscope controls the filter (bell, diaphragm, and extended range) on all stethoscopes whilst each stethoscope has independent control of the volume Littmann Listen-In enables a smart phone device to link with a maximum of five Littmann Model 3200 Stethoscopes. One stethoscope acts as the presenting stethoscope while the other 1-4 stethoscopes act as listening stethoscopes. The presenting stethoscope acquires the acoustic information and sends it to the smart phone via Bluetooth® wireless communication. The smart phone then retransmits the acoustic information via Bluetooth® to the listening stethoscopes.