CORE Digital Attachment

$ 199.00


FDA Cleared

HIPAA Compliant

Free Shipping

1-Year Warranty

30 Day Returns

Money Back Guarantee

Product Overview

  • FDA cleared, CE marked, and used by clinicians at over 4,000 hospitals.
  • Attaches to your own stethoscope, amplifying sounds up to 40X for loud, clear auscultation.
  • Compatible with most popular analog stethoscope models from 3M Littmann, ADC, WelchAllyn Harvey, MDF, and Medline.
  • Capture, visualize and save sounds, securely share sounds for a second opinion, and analyze them supported by proprietary Eko algorithms.
  • Add an Eko Enterprise Plan to pair with popular telemedicine platforms for auscultation live streaming.
  • Includes CORE attachment with 9-hour rechargeable battery, Bluetooth LE connectivity, software for Android, iOS and Windows, and one year warranty support.

Digitize the Stethoscope You Already Own

Eko’s original innovation, the CORE attaches to your own stethoscope to digitize auscultation. Toggle between traditional analog examination and rich, clear heart and lung sounds amplified up to 40 times. The data CORE collects streams wirelessly to a clinician’s smartphone or tablet for audible and visual analysis via Eko’s patient-friendly software. Capture and store sounds. Analyze waveforms with decision support provided by advanced algorithms. Or easily share for a second opinion. CORE attaches to most popular tubular stethoscopes to provide entry into auscultation powerful enough for cardiologists yet affordable enough for nurses, researchers and students.

Pair with Eko Software

Pair CORE with our mobile app to unlock a powerful software toolkit.

  • Visualize heart sound waveform (phonocardiogram) in real-time
  • Capture 15, 30, 60, or 120 second recordings
  • Save & annotate recordings in the secure dashboard
  • Securely share recordings for a second opinion
  • Create a library of heart sounds for education or to monitor the progression of a disease
  • Perform auscultation live streaming for telemedicine consults with an Eko Enterprise Plan


Apple devices with iOS 11 or later

Samsung, Google, and other Android devices 5 and up

Most PCs with Windows 7 and above

Tech Specs

Digital Stethoscope

  • 40x amplification
  • 7 volume settings
  • Digital & acoustic sound modes
  • 20Hz - 2Khz frequency response
  • 4000Hz sample rate



  • 1.8 ounces (52 grams)



  • 3.5 inches (90 mm) L



  • Bluetooth 4.0 low-energy
  • .WAV and .PDF file formats



  • Easy on/off toggle 
  • Micro-USB charging
  • Rechargeable lithium-ion battery with 9-hour life


  • Works with common single tubed Littmann™, Welch Allyn™, MDF™, ADC™, and Medline stethoscopes
  • Works with pediatric and infant stethoscopes



  • Materials: 6061 machined aluminum
  • High-impact ABS thermoplastic
  • Does not contain natural rubber latex or phthalate plasticizers
  • Clean with isopropyl alcohol wipes


Certifications & Licenses 

  • FDA Cleared
  • CE Marked
  • ISO 13485 Certified
  • MDSAP Certified
  • CDPH Licensed
  • HealthCanada Licensed
  • Brazil ANVISA Licensed
  • TGA Australia Licensed
  • HIPAA Compliant
  • TAA Compliant


Return Policy

30-Day Money Back Guarantee: If you are unsatisfied with the Product(s) you purchased, you may return the Product within 30 days of receiving it. To be eligible to receive a refund of your purchase price, you must request a Return Merchandise Authorization (RMA) number from Eko during the 30-day period following the date you received the Product from Eko., and proof of purchase may be requested. You may request an RMA number by submitting a request to Eko Customer Support. 

Refunds are not guaranteed, and Eko reserves the right to deny a refund for any reason, including without limitation the following:

  • If the Product is damaged in any way
  • If you return the Product more than 30 days after receiving it

NOTE: If you received a damaged Product directly from Eko, please contact Eko Customer Support by emailing

Limited Warranty: Eko Devices, Inc.(“Eko”) expressly warrants that the Eko Core or Eko Duo (the “Product”) will materially conform to its published specifications and be reasonably free from defects in materials and workmanship for a period of ONE (1) YEAR commencing on the date of delivery of the Product to you (the “Warranty Period”). This Limited Warranty only applies to products which are purchased directly from Eko and used, stored, and handled in the manner recommended by Eko.  




4.73 Average

89 Reviews

Christine R

I am an audiologist and ordered the EKO Core amplifying attachment for a patient of mine who is a nurse to try. She was thrilled with the improvement noted using her personal stethoscope with this attachment. I am now recommending this amplifying attachment for any of my patients who work in the medical field and comment on difficulty with using a stethoscope.

Hi Christine, Thanks for the awesome review! So glad to hear that the Eko CORE is working out for your patients :) Best, Emily


I am getting a bit older, so it can be difficult for me to hear through my Littmann with the same precision as twenty years ago. I found this attachment that goes onto my stethoscope and it allows me to listen both normal and amplified. I don't use amplified all the time, but when I do it's helpful.

Nora C

As a new nurse, I found this product to be of great help. I have recommended it to other nurses that have asked about it. It makes auscultating much more comfortable in identifying if something is wrong.

Todd A

See previous review

Robert J

After 30 years of listening to sirens and aircraft noise my hearing is not what it use to be this device has made listening to breath sounds and heart tones much easier and more efficient.

Markus R

Took a while to get cleared by german customs but finally received my Eko Core without paying additional taxes. Assembly using my Littmann Master Cardiology was easy and smooth. Sound amplification is excellent, however, a quiet set-up is needed to keep background noises to the minimum. As a gastroenterologist I also use it for bowel sounds. The iPhone/iPad App is sophisticated and connecting the Eko Core works like a charm. Saving the recording requires a speedy internet connection, unfortunately, I can't connect my iPhone to our hospital wifi due to data regulations. An option to save the data to the iPhone/iPad offline (and upload to the cloud later) would be welcome and earn 5/5 in my rating. The sound waves are best viewed on the computer, interpretation needs some practice. Overall, I am impressed by the performance of the Eco Core.


The device worked wonderfully, and was very robust. I enjoyed it very much. However, it is very difficult to remove the tubing of my original stethoscope (mine is 3M Littmann classic II). There were absolutely no instruction that I can find on the internet, except to pull, but when I did, the tubing ripped. It would be helpful if you tell us how to do it.


Awesome. Love the attachment, sounds are great!

Gene R

8 out of 10

Terry H

Seems to work well. Easy to set up. Also very nice that can be used without amplification, if one runs out of battery power...other amplified stethoscopes cannot be used if out of power.

John W

The CORE Attachment worked just as explained. It has turned my regular stethascope into a digital stethascope that can enhance the organ sounds to acquire a proper understanding of the Pt's condition. It records well and we can listen later. It is too quiet to hear directly through my bluetooth hearing aids live and if I turn up the aids it becomes distorted. This was discussed before buying. It is an excellent digital stethascope and will help in my practice on the ambulance. GOOD JOB EKO

YaYa A

Have to play with the volume so it doesn’t pick up any external noise, but once you find the perfect setting you can hear perfect and clearly.

Brian B

it has made listening to lung better as I am able to listen for more distinct sounds and can catch symptoms of upper respiratory infections sooner that I could before, I can hear the distinct different sounds of the heart beat as well. It fits well on my cardiac stethoscope and it still fits around my neck comfortably.

Wayne H

Got the attachment for a pre-existing scope. Works great in hard to hear settings. Too much noise if auscultation over clothes. Does make the scope very long so a bear fitting in cargo pants. Use it in clinic setting where length is not an issue but when volunteering on EMS length is an issue. Instructions state that you should not shorten your tuning.


It does what I expected it to do and more! What I'm hoping for is analytics to breakdown the data to get more detailed information (Being able to highlight what area I'm auscultating and a breakdown of what the sound means [A second opinion, if you will]). I am having a slight problem with the quality of sound generated by the software on my phone (Terrible) compared to using the stethoscope (amazing). I am looking forward to the AI you have in store!

Glenn D

I am thrilled with the EKO amplifier device itself. I've heard breath sounds with the EKO that I've never heard before. The learning curve is sharp but brief and it opens up a whole new world, especially to those like myself who have long-term hearing problems. My ONLY complaint is the app. It hasn't matured yet and won't reproduce sounds on the iPad speakers worthy of the classroom. As soon as EKO does that, they get a full 5 stars.

Annette S

I am very impressed with my core attachment. The sounds are very clear and it is so easy to use.

Annette S

I am very pleased with my Eko core attachment. I use it with my Littmann Cardiology II.


Great product. I can auscultation heart and breath sounds much clearer, especially in a moving squad with sirens.

Robert H

I have used this device for a few weeks. Primarily I use it simply for amplification of sounds. As an older physician my hearing acuity has diminished and this device allows to me to hear sounds (especially cardiac and pulmonary) that might otherwise be missed. It is a valuable clinical tool.

James H

I am a partially deaf dog breeder. I like having the ability to auscultate heart, breathing and, digestive processes of expecting dams and newborn neonates. The EKO attachment allows me to hear and record on a cell phone and let another breeder or emergency vet some distance away who may be able to assist.


The eko works great with my littmann stethoscope. I like how it is slim without a lot of bulky buttons and I like how it is easy to charge and last a long time. The sound quality is amazing! I’m so happy with this. I can use it when I want, and not use it when I don’t need to!

Kayla P

So far I’ve had my Eko attachment for a few weeks. It’s so clear and loud that it’s convjnced a few of my coworkers to purchase one too! Way better than my Littmann 3100 that only lasted two years and broke.

Kayla P

So far I’ve had my Eko attachment for a few weeks. It’s so clear and loud that it’s convjnced a few of my coworkers to purchase one too! Way better than my Littmann 3100 that only lasted two years and broke.

Jason G

This was easy to install and easy to use in the field. It's not perfect but it's the best one out there for the price, especially for those subtle heart and lung findings. I haven't quite figured out how to integrate the app effectively into my workflow, but it looks promising.

Sandeep G

I am mainly internal medicine doctor and Rheumatology fellow, who likes to record and listen to heart sound carefully as I see quite a bit of scleroderma and see sick hospitalized patients. This Eko core attachment is amazing and I can hear so much better especially in hospitalized patient, where they give you poor effort or not able to position pt for comprehensive exam. I would highly recommend it for any internal medicine or subspecialities mainly Cardiology, Pulmonary and Rheumatology.


Would be great to add noise filter for it

Aaron M

This product is everything that I thought it would be and more. I enjoy the fact that I can use my stethoscope with the Eko on or off so I can save the battery power for when I really need it. Also, the graphical representation from the phone app is great because it helps to eliminate any possible ambiguity as to whether you are hearing a heart murmur or not. The ability to amplify the sound is outstanding and it is remarkable how loud you can make it without suffering a decline in the quality of the sound. It is an amazing product and I very highly recommend it.

Shirley B

The user support is absolutely incredible! Thanks for a great product with superior support. The technology to listen to heart sounds in one location and have another person hear the sounds in a distant location is incredible!!

Paul H

This stethoscope is great in a noisy ambulance! Makes it so much more accurate to get vitals. Used it in a household full of dogs and the patient commented on me being able to hear over all the barking. :-)