This is a barely used Eko Digital Core attachment. This worked so well I decided to purchase the Eko Stethoscope, so I really no longer need this. I only used this for 3 months. It is INCREDIBLE. There are a lot of videos online that show that it can do. Of you are a student learning blood pressures, wear hearing aids and struggling with a standard scope, or in the field in a busy ER and can't hear through your scope, THIS IS WORTH IT. Price is firm.