You don't need a new stethoscope. If you already own a quality analog scope, a digital stethoscope attachment can convert it into a recording, amplifying, AI-ready device for a fraction of the replacement cost. But the category is genuinely confusing, the subscription model isn't always transparent, and the compatibility fine print trips up a lot of buyers.
This guide breaks down how attachments work, which stethoscopes accept them, what the Eko CORE Digital Attachment actually does versus what requires a paid subscription, and when buying a purpose-built digital stethoscope makes more sense than retrofitting your existing one.
At a Glance
| Topic | Key Facts |
|---|---|
| What it is | An add-on module that converts an analog stethoscope into a digital one |
| Primary product | Eko CORE Digital Attachment |
| Compatible brands | Littmann, ADC, Welch Allyn, MDF, Medline (single-lumen only) |
| NOT compatible | Sprague Rappaport-type, double-lumen stethoscopes |
| Amplification | Up to 40x with active noise cancellation |
| Battery life | Up to 80 hours |
| App | Free tier available; Eko+ subscription at $119.99/yr unlocks AI detection and sharing |
| AI features | FDA-cleared murmur and AFib detection (AFib requires CORE 500, not attachment alone) |
| Cost comparison | Attachment ( |
| Best for | Clinicians who already own a quality scope and want digital features without replacing it |
What Is a Digital Stethoscope Attachment, and How Is It Different from a Full Digital Stethoscope?
A digital stethoscope attachment is an add-on module that replaces the traditional chestpiece connection on an existing analog stethoscope, converting acoustic sound into a digital signal that can be amplified, visualized, and recorded. A purpose-built digital stethoscope, by contrast, is an entirely new device with its own chestpiece, tubing, and integrated electronics.
The distinction matters for buyers because the two categories have meaningfully different price points, use cases, and tradeoffs:
| Feature | Digital Attachment (e.g., Eko CORE) | Full Digital Stethoscope (e.g., CORE 500) |
|---|---|---|
| Works with existing scope | Yes | No |
| Upfront cost | ~$299 | ~$449 |
| ECG integration | No | Yes (CORE 500) |
| Single-device warranty | No (two components) | Yes |
| Backward compatibility | Yes | No |
| Best for | Upgrading a scope you already trust | Starting fresh or needing ECG |
The attachment category was designed for clinicians who have spent years calibrating to the acoustic feel of a specific scope. Replacing that scope means relearning a familiar instrument. The attachment sidesteps that entirely.
How the Eko CORE Digital Attachment Works
The Eko CORE Digital Attachment intercepts the acoustic signal at the junction between the chestpiece and tubing, converts it to a digital signal, applies electronic amplification, and transmits the output both through the earpieces and wirelessly via Bluetooth to the Eko App. The device toggles between analog mode (standard acoustic pass-through) and amplified digital mode, so clinicians can switch mid-examination without removing the device.
Amplification and Active Noise Cancellation Explained
The CORE attachment delivers up to 40x amplification relative to analog mode, with seven adjustable volume levels. This amplification is calibrated to the lower frequency ranges that matter most for heart and lung sounds, where acoustic stethoscopes lose sensitivity most quickly in noisy environments.
Active noise cancellation (ANC) filters out ambient sound, making the device particularly practical in high-noise settings like emergency departments and ICUs, where background equipment noise regularly competes with auscultation. The 80-hour battery life (on a 2.5-hour charge) means the device can run across multiple full shifts without recharging.
Waveform Visualization and the Eko App: Free vs. Eko+
The Eko App, available on iOS and Android, displays a real-time phonocardiogram waveform during auscultation. The free tier is functional but limited. The Eko+ subscription ($119.99/year) unlocks the features most clinicians actually want from a digital upgrade:
| Feature | Free Tier | Eko+ ($119.99/yr) |
|---|---|---|
| Real-time waveform visualization | Yes | Yes |
| Bluetooth amplification | Yes | Yes |
| Single sound recording | Yes | Yes |
| Unlimited recordings | No | Yes |
| AI murmur detection | No | Yes |
| AFib detection | No | Yes (CORE 500 only) |
| Secure sharing / telehealth | No | Yes |
| EMR upload | No | Yes |
The free tier is genuinely useful for visualization and basic recording. The AI-powered clinical features, though, are subscription-only. That's the piece most product pages gloss over.
Compatibility: Which Stethoscopes Work With the Digital Attachment?
The Eko CORE attachment is compatible with single-lumen stethoscopes from Littmann, ADC, Welch Allyn, MDF, and Medline. Adapters are available for adult, pediatric, and neonatal chestpiece sizes, which matters for providers who work across patient populations.
Not compatible: Sprague Rappaport-type stethoscopes and any double-lumen design (where the tubing contains two separate acoustic channels). These architectures don't allow the attachment to sit correctly in the signal path.
Quick Compatibility Checklist
Before purchasing, confirm all of the following:
- The stethoscope uses a single-lumen tube (one channel running through the tubing).
- The chestpiece uses a standard threaded connection.
- The brand is Littmann, ADC, Welch Allyn, MDF, or Medline.
- The chestpiece size (adult, pediatric, or neonatal) matches an available adapter.
If any of those conditions aren't met, the attachment won't fit correctly and won't deliver accurate amplification. A clinician unsure about their specific model can check the Eko Health compatibility guide at ekohealth.com before purchasing.
Step-by-Step: How to Attach and Set Up the Digital Attachment
Setup takes under 10 minutes. Here's the full process:
- Remove the tubing from the chestpiece of the existing stethoscope.
- Select the correct adapter (adult, pediatric, or neonatal) from the included kit.
- Attach the adapter to the chestpiece port, then connect the CORE attachment module to the adapter.
- Reattach the tubing to the other end of the CORE module.
- Charge the device via USB for approximately 2.5 hours before first use (full battery = 80 hours).
- Download the Eko App on iOS or Android and create an account.
- Pair via Bluetooth: Press the power button on the CORE module; a white flashing LED indicates it's ready to pair. Open the Eko App and follow the in-app pairing prompt.
- Activate amplified mode: Toggle the mode button on the device. Green solid LED = full battery and active; yellow blinking = charging; white flash = ready to pair.
Once paired, the real-time waveform appears automatically in the app during auscultation. Amplification and ANC are active by default in digital mode.
AI-Powered Detection: Murmurs, AFib, and What the Evidence Actually Shows
The Eko CORE platform has accumulated 9 FDA clearances and over 70 peer-reviewed publications supporting its AI models for cardiac auscultation. The AI screening functionality, available through the Eko+ subscription, is built on the Eko EFAST model and is trained to flag structural murmurs, bradycardia, and tachycardia from phonocardiogram recordings.
A 2023 study published in PMC (PMC10177339) reviewing advancements in stethoscope technology identified digital amplification and AI-assisted auscultation as the most clinically significant developments in the category over the past decade. Mayo Clinic has independently validated Eko's murmur detection model in published research.
Two important caveats for clinical context: AFib detection is available on the Eko CORE 500 (the purpose-built device) but not on the CORE attachment alone, which lacks the ECG lead required for rhythm classification. And AI-assisted detection is a screening aid, not a standalone diagnosis. A physician should review any flagged finding in the context of the full clinical picture.
"AI-assisted auscultation tools are intended to support clinical decision-making, not replace it." — Eko Health clinical guidance
Research from a 2025 study in the Netherlands Heart Journal found that AI-enabled digital stethoscopes demonstrated strong sensitivity for detecting structural murmurs in primary care settings, supporting their role as a triage tool before formal echocardiography. A separate clinical study reported by the BBC in August 2025 involving the CORE 500 further expanded the evidence base for AI-assisted cardiac screening in community settings.
Is the Digital Attachment Worth It? Attachment vs. Buying a New Digital Stethoscope
This is the question no product page will answer directly, so here's the framework.
The total cost of adding the Eko CORE attachment ($299) to an existing Littmann Cardiology IV ($250 at retail) is approximately $549. A standalone Eko CORE 500 runs approximately $449. On cost alone, the attachment pathway is more expensive if you don't already own a quality scope.
But cost isn't the only variable.
Choose the attachment if:
- A trusted analog scope is already in daily use and the acoustic feel matters.
- Backward compatibility with analog mode is needed during the learning curve.
- Lower upfront outlay is required (the attachment alone at $299 vs. full replacement).
- ECG integration is not a clinical priority.
Choose a new full digital device if:
- ECG integration and AFib detection are required at the point of care.
- A single-device warranty and unified support are preferable.
- Starting from scratch without an existing scope worth preserving.
- The Eko CORE 500 bundle through a brand like FIGS (the FIGS Eko CORE 500 digital stethoscope) is available at a price point that makes the full device competitive.
Neither path is universally correct. The attachment is the smarter choice for clinicians with a scope they trust. The full device is the right call when ECG capability is a workflow requirement.
Using a Digital Stethoscope Attachment With Hearing Loss
Clinicians with hearing loss have historically faced a genuinely difficult tradeoff between the acoustic fidelity of high-quality analog stethoscopes and the amplification of dedicated amplified models. The digital attachment addresses that tradeoff across three mechanisms.
First, the 40x amplification at peak cardiac frequency ranges substantially improves detection of low-frequency heart sounds, including S3 and S4 gallops, which are among the first auscultatory findings to become inaudible as high-frequency hearing loss progresses.
Second, the real-time phonocardiogram waveform in the Eko App provides visual confirmation of sounds that may be difficult to hear reliably, allowing clinicians to correlate what they're seeing on screen with what they're hearing through the earpieces.
Third, the Eko App supports direct Bluetooth streaming to compatible hearing aids and cochlear implants, bypassing the earpieces entirely and delivering amplified audio directly into the clinician's hearing devices.
A study examining hearing loss prevalence among physicians, cited in PMC research data, estimated that 20 to 38% of physicians over 60 experience some degree of clinically relevant hearing loss. The combination of amplification, waveform visualization, and direct hearing device streaming makes the digital attachment one of the most practically useful accommodations available to affected clinicians.
Telehealth and Remote Auscultation: Using the Attachment for Virtual Care
The expansion of telehealth services following COVID-19 created a genuine clinical gap: remote visits were increasingly normalized, but cardiac and pulmonary auscultation remained difficult to conduct outside of in-person settings. The Eko+ subscription addresses this with a HIPAA-compliant recording and secure sharing workflow.
With an active Eko+ subscription, a clinician can record a patient's heart or lung sounds, save them to the app, and share them securely with a specialist for remote second opinion, all without the patient needing to travel. Recordings can also be uploaded to compatible EMR systems for documentation.
It's worth being clear about what requires the subscription: Bluetooth amplification and real-time waveform display work on the free tier. Recording, sharing, and telehealth-oriented workflows require Eko+.
For providers exploring the full scope of what virtual primary care can offer, the ability to transmit auscultation recordings adds a clinically meaningful data layer to video-based consultations that text symptom reports cannot replicate. Questions about whether telehealth visits are covered by insurance are worth checking before building remote auscultation into a billing workflow.
Who Should Buy the Digital Stethoscope Attachment? A Role-by-Role Breakdown
The attachment isn't one-size-fits-all. Here's how it maps to different clinical roles:
Emergency and ICU nurses: The ANC feature is the primary draw. Noisy environments degrade acoustic stethoscopes significantly; 40x amplification with noise filtering restores reliable auscultation at the bedside.
Cardiologists: Waveform visualization and AI murmur screening add a documentation and triage layer to routine auscultation. Useful for flagging cases that warrant formal echocardiography.
Primary care physicians: AI-assisted murmur detection supports earlier referral of findings that might otherwise go uncharacterized between annual visits.
Medical students and educators: The phonocardiogram waveform is a teaching tool. Correlating visual waveform patterns with acoustic findings accelerates auscultation learning in ways verbal instruction alone cannot.
Telehealth providers: HIPAA-compliant recording and sharing make the attachment a practical add-on for any provider conducting cardiac assessments via video visit.
Clinicians with hearing loss: As described above, the amplification and direct Bluetooth streaming to hearing devices address a genuine clinical accessibility gap.
On reimbursement: The Eko CORE Digital Attachment is eligible for HSA and FSA reimbursement in the US. Some CME programs also include clinical technology in eligible expense categories. It's worth confirming with a benefits administrator before purchasing.
Frequently Asked Questions
Q1: What is the Littmann CORE digital stethoscope attachment?
The Littmann CORE attachment (more precisely, the Eko CORE Digital Attachment) is a module that installs between the chestpiece and tubing of a compatible Littmann stethoscope. It adds electronic amplification of up to 40x, active noise cancellation, Bluetooth connectivity, and phonocardiogram visualization through the Eko App. It does not replace the Littmann scope; it upgrades it.
Q2: Can you turn a regular stethoscope into a digital one?
Yes, with conditions. The Eko CORE attachment converts single-lumen analog stethoscopes from compatible brands (Littmann, ADC, Welch Allyn, MDF, Medline) into digital devices. Sprague Rappaport-type and double-lumen stethoscopes are not compatible.
Q3: Is the Eko attachment compatible with all Littmann stethoscopes?
No. Single-lumen Littmann models are generally compatible. The attachment requires a standard threaded chestpiece connection and a single-channel tube. Confirming the specific model against Eko Health's compatibility list before purchase is the safest approach.
Q4: Does the digital attachment reduce sound quality compared to a full digital stethoscope?
In amplified mode, the attachment delivers comparable acoustic performance to purpose-built digital stethoscopes for standard cardiac and pulmonary auscultation. The primary hardware difference is the absence of ECG integration, which requires the CORE 500. Some clinicians report a minor acoustic difference in analog pass-through mode due to the additional module mass, but amplified mode eliminates this as a practical concern.
Q5: Where can I buy a digital stethoscope attachment near me?
The Eko CORE Digital Attachment is available directly through ekohealth.com, through medical supply distributors, and through retail partners including FIGS (as part of the FIGS Eko CORE 500 collaboration). HSA and FSA cards are accepted at most purchase points.
The Bottom Line
A digital stethoscope attachment makes sense when a clinician already owns a reliable analog scope and wants recording, amplification, AI screening, or telehealth capability without replacing an instrument they've calibrated to over years of practice. The Eko CORE is currently the dominant product in the category and has the strongest clinical evidence base behind it.
The attachment path costs more in total hardware than a standalone CORE 500 if starting without a scope. But for anyone already holding a Littmann Cardiology IV or equivalent, the attachment is a pragmatic, reversible upgrade that preserves what works and adds what's missing.
For clinicians unsure which path fits their clinical workflow, find a specialist near you who can advise on diagnostic tools appropriate for your practice setting. For a broader overview of how digital health tools are reshaping point-of-care practice, Momentary Lab's AI healthcare navigator covers the full landscape.
