The first one I bought was for myself for nursing school and my current job as a paramedic in the Emergency Room. This one was for my wife that is a Correctional Nurse that works in a noisy inviroment that has a lot of echoes because of the acoustics of the building. She says it has made her job better now that she can hear so much better when assessing inmates. I have also promoted sales of this product at work due to the amazing product that this is. I joke all the time about I need compensation for promoting your product, but your product is so easy to promote from the first time when someone uses it. Most have nice and expensive Stethoscopes already, so I promote adding this attachment to make it even better... I did to both of my purchases...