3M Littman Electronic Stethoscope Model 3200 27" Black with Bluetooth Technology. Model 3200 brings you the very latest thinking in advanced auscultation technology. The combination of exceptional sound quality, user-friendly interface, on-board recording and Bluetooth technology that wirelessly sends sounds to software that can help detect suspected heart murmurs or visualize heart and lung sounds, redefines what a stethoscope can do for you. Key features include: 85% ambient noise reduction. Up to 24K sound amplification when needed. LCD display with backlight. Auto-on technology for seamless clinician/patient interface. On-board recording. Bluetooth technology. Free Zargis Steth Assist Heart & Lung Sound Visualization Software. Compatible with Zargis Cardioscan Heart Murmur Detection Software (sold separately). Durable construction for years of trouble free use.