What is the Littmann CORE digital stethoscope?

The Littmann CORE digital stethoscope is a cardiology-level device that combines the mechanical base of the classic Cardiology IV with an electronic module attached to the chest piece. This module adds up to 40x sound amplification at the peak frequency, active noise cancellation, and Bluetooth connectivity with the Eko app for visualizing and analyzing auscultated sounds.

Unlike other electronic stethoscopes on the market, the CORE maintains its mechanical analog function even when the digital module is off or its battery is dead. This means the doctor never loses the basic auscultation tool: if the battery runs out in the middle of a shift, the instrument continues to function as a conventional Cardiology IV.

The product is manufactured by Littmann (a Solventum brand, formerly 3M Health Care) and was designed for doctors, residents, nurses, and other healthcare professionals who perform high-demand cardiac and pulmonary auscultation in clinical environments.

How does the Littmann CORE digital stethoscope's amplification work?

The 40x amplification in the Littmann CORE digital stethoscope means that, at peak frequency, body sounds reach the examiner's ear with an intensity up to 40 times greater than in passive analog mode. This gain is adjustable in 7 increments via the digital module's side volume buttons, allowing the intensity to be calibrated according to the environment and clinical need.

The technology is especially useful for detecting low-intensity murmurs, subtle lung sounds in obese patients or those with thick chests, and for professionals working in noisy environments such as emergency rooms, ICUs, or operating theaters. To activate amplified mode, simply press the on/off button on the chest-piece module. The LED light flashes white, indicating that the device is active and ready to pair with the app.

Noise cancellation in Littmann CORE: how it works and how to activate it

The Littmann CORE digital stethoscope's active noise cancellation analyzes ambient sounds in real-time and electronically attenuates them before they reach the professional's ear canal. The feature needs to be manually activated via the Eko app, in the CORE's settings menu, as the default setting is off.

In clinical practice, noise cancellation is most relevant in highly noisy scenarios: emergency shifts, ICU beds with monitor alarms, busy corridors, and pre-operative rooms. The technology does not completely eliminate ambient noise but significantly reduces interference, making cardiac and pulmonary sounds clearer to the examiner. Turning off the digital module also automatically deactivates noise cancellation.

Tunable diaphragm and pediatric use in Littmann CORE

The Littmann CORE features two pressure-adjustable diaphragms: an adult and a pediatric one, eliminating the need to reposition or turn the chest piece during examination. This tunable diaphragm technology was developed by 3M Health Care itself and allows for capturing low frequencies (light pressure) and high frequencies (firm pressure) with the same side of the chest piece, simply by varying the force applied to the patient.

To switch between the adult and pediatric sides, simply rotate the chest piece and index the desired side, which automatically closes the other side and prevents sound entry from it. This configuration reduces noise artifacts and improves auscultation quality in children without the need to change stethoscopes.

In the Eko app, additional frequency filters can be selected: Wide (default), Cardiac (emphasizes low frequencies, ideal for heart sounds), and Pulmonary (emphasizes high frequencies, useful for respiratory sounds). The filter selection is saved between sessions.

Bluetooth connectivity and the Eko app in the Littmann CORE digital stethoscope

The Littmann CORE digital stethoscope connects via Bluetooth to smartphones and tablets to transmit sounds in real-time to the Eko app, which allows for visualizing the sound wave, recording, and analyzing auscultations. Bluetooth connectivity is not mandatory for amplification to work: the amplified digital mode operates normally through the stethoscope's earpieces even without pairing with the app.

The Eko app is available for iOS (version 15 or higher) and Android, and also offers versions in English, Japanese, Spanish, German, French, Portuguese, and Italian. To create, save, and share multiple recordings, an Eko+ subscription is required, which is paid and sold separately by Eko Health.

The device status is indicated by the module's LED light: flashing white means active and waiting for pairing; solid white confirms it's paired with the app; yellow indicates charging in progress; flashing yellow signals low battery; and green indicates a full charge. Important: the module does not function while connected to the charger.

AI for murmur detection: how Eko AI works in Littmann CORE

The Littmann CORE, integrated with the Eko app with an Eko+ subscription, offers artificial intelligence analysis capable of signaling the presence of possible heart murmurs, bradycardia, and tachycardia based on auscultated sounds. This feature is called Eko AI and uses machine learning algorithms developed and validated by Eko Health.

It is important to emphasize that the results generated by Eko AI are clinical decision support tools, not autonomous diagnoses. The system flags suspicious findings for the professional to evaluate more carefully, accelerating screening without replacing medical judgment. FDA approval (the American regulatory agency) applies to use in the United States; local regulations may vary in other countries, including Brazil.

Who is the Littmann CORE digital stethoscope indicated for?

The Littmann CORE digital stethoscope is especially indicated for cardiologists, pulmonologists, intensivists, emergency physicians, and any professional who performs high-demand auscultation in noisy environments or with patients difficult to auscultate.

Technical specifications of the Littmann CORE digital stethoscope

The Littmann CORE measures 69 cm from chest piece to earpieces and weighs 232 grams, similar to the conventional Cardiology IV, despite the attached electronic module.

• Amplification

  Up to 40x at peak frequency compared to analog mode, adjustable in 7 volume increments using the module's side buttons.
• Battery and charging

  8 hours of continuous digital use with Bluetooth active; full charge in 2.5 hours via included micro-USB cable. 5-minute standby mode without use to preserve charge.
• Connectivity

  Bluetooth with iOS 15+ and Android smartphones and tablets. Compatible with the Eko app (available in Portuguese). Does not connect directly to Bluetooth headphones: wireless audio is streamed via the app.
• Materials and safety

  No natural rubber latex or phthalate plasticizers in the tubing. Weighs 232g, 69 cm length. Should not be used in an MRI environment due to metallic components.
• Warranty

  2-year warranty (shorter than the 3 years for the analog Cardiology IV, due to the complexity of electronic components).
• Available finishes

  Four options: matte black chest piece, polished mirror chest piece, polished copper chest piece, and polished rainbow chest piece. Allows customization by laser engraving (scratching is not recommended as it generates frictional noise).
• Cleaning and maintenance

  External surfaces with 70% isopropyl alcohol. Do not immerse in liquid, do not autoclave, and do not expose to extreme heat. The digital module does not need to be removed for routine cleaning.

Littmann CORE digital stethoscope vs. Cardiology IV: differences and when it's worth it

The Littmann CORE digital stethoscope is, in essence, a Cardiology IV with a digital module attached to the chest piece. The acoustic base is the same: both offer the cardiological auscultation quality of Littmann's top line. The difference lies in the additional features of the electronic module and the investment involved.

The analog Cardiology IV has practical advantages: it doesn't rely on batteries, has a 3-year warranty (vs. 2 years for the CORE), and is lighter without the module. The CORE justifies the higher investment when there is a real need for amplification, such as when examining obese patients, in noisy environments, or when documentation and sharing of sounds have clinical or educational value.

It is also possible to purchase the digital module (CORE Digital Attachment) separately and attach it to an existing Cardiology IV, which can be a cost-effective alternative for those who already own the analog stethoscope.

How to use the Littmann CORE digital stethoscope for best auscultation quality

To achieve maximum sound quality with the Littmann CORE digital stethoscope, five basic precautions related to positioning and instrument maintenance must be followed.

• Index the correct side of the chest piece

  When rotating the chest piece, open the side you wish to use (adult or pediatric diaphragm) so that the other side remains closed and does not interfere with auscultation.
• Earpieces pointed forward

  The eartips should be oriented forward, aligned with the ear canal, before inserting them. Incorrect alignment reduces sealing and compromises sound transmission.
• Choose the correct eartip size

  The box includes small and large eartips. Using the size that provides a comfortable seal ensures better isolation and sound quality. An inadequate seal reduces amplification efficiency.
• Keep the chest piece free of debris

  Fabric lint from lab coats or scrubs can accumulate and obstruct the sound path. Regular cleaning with 70% alcohol and covering the bell with the removable diaphragm when not in use prevents this problem.
• Avoid prolonged contact of the tubing with skin

  PVC tubing hardens with exposure to human skin lipids over time. Wearing the stethoscope over a collar or lab coat, and not directly on the neck, extends the tubing's lifespan.

Frequently asked questions about the Littmann CORE digital stethoscope

Direct answers to the most common questions about the Littmann CORE digital stethoscope.