The Adscope 601 Convertible Cardiology Stethoscope is designed for performance, comfort and versatility. Its dual channel (bi-lumen) headset optimizes sound quality, while its adjustable frequency (AFD) technology allows custom tuning to enhance high and low frequency response in the diaphragms of both adults and children. The headset is made with heavy-walled tubing that can withstand thousands of cycles of use. Adsoft Plus silicone eartips with snap-on connection provide superior wearing comfort and acoustic seal. This device's overall length is 28".