I am a soon to be nursing student with severe hearing loss. I wear bilateral hearing aids and using a stethoscope just wasn't possible for me. When I found EKO and purchased the Core Digital Attachment, they made it possible for me to use a stethoscope. I can hear through my stethoscope very loud and clear and the noise cancellation is just awesome. The product made me extremely emotional in a good way and I am thrilled that I stumbled across EKO. Thank you EKO for making it possible to use stethoscopes for people with disabilities like me. I HIGHLY recommend this product to you if you are reading this.