HeartMath Inner Balance Coherence Plus - HRV Sensor

The Inner Balance Coherence Plus makes it easy to add guided HRV training to your daily routine. Just clip on the sensor, connect to your device, and use the feedback to practice breathing, track changes in your heart rhythm, and build a more consistent relaxation routine.

The Inner Balance Coherence Plus is an HRV biofeedback sensor designed for use with HeartMath apps. It measures pulse data from the ear and converts that information into heart rate variability (HRV) data and a real-time coherence score.

The system can be used for guided breathing and HRV biofeedback exercises, with session data displayed in the HeartMath app.

How the Inner Balance Coherence Plus Works

Heart rate variability, or HRV, refers to the variation in time between heartbeats. HRV patterns change in response to factors such as breathing, activity, and autonomic nervous system activity.

The Inner Balance Coherence Plus measures pulse-wave data using an optical ear sensor. HeartMath software analyzes the resulting heart rate and HRV data and calculates a coherence score that updates during the session.

Users can view changes in their HRV patterns and coherence score while practicing breathing or other HeartMath exercises.

Sensor and Connectivity

The Inner Balance Coherence Plus uses optical photodetectors to sample the pulse wave at 500 Hz.

Heart rate and HRV data are processed by HeartMath software and used to calculate a real-time coherence score that updates every 5 seconds.

Additional hardware features include:

• 500 Hz pulse-wave sampling rate provides detailed data for heart rate and HRV measurement
• LED photodetector optically measures pulse changes at the earlobe
• Automatic gain control adjusts measurement resolution in real time
• Status lights let you quickly check session, battery, and app connection status
• PC-ABS thermoplastic housing provides a durable enclosure for regular use
• Metal clothing clip attaches the sensor pod to your clothing during use
• Braided cable adds durability for repeated use
• Detachable ear clip allows individual ear clips to be replaced or shared between users
• Bluetooth connectivity provides a wireless connection to compatible devices
• USB-C connectivity provides a wired connection to supported computers and Android devices
• HeartMath app compatibility supports HRV and coherence training

HRV and Coherence Training

The HeartMath system uses HRV biofeedback to provide users with real-time information about changes in their heart rhythm patterns.

HeartMath's proprietary algorithm analyzes heart rate and HRV data and calculates a coherence score. Users can observe how breathing patterns and other exercises affect that score during a session.

The HeartMath App

Purchase of the Inner Balance Coherence Plus sensor includes a lifetime subscription to the HeartMath app.

The app includes HRV and coherence measurements, guided exercises, educational material, courses, learning programs, audio content, and structured practices.

Technical Specifications

Bluetooth Compatibility

Requires Bluetooth 4.0 or higher.

The Inner Balance Bluetooth connection uses Bluetooth Low Energy (BLE). According to HeartMath, the Bluetooth module operates at an output power of 0.5 mW or less.

The Bluetooth transmitter is located in the module that attaches to the user's clothing rather than in the ear sensor.

iOS

• HeartMath app: iOS 26.0 or above
• Inner Balance app: iOS 15.0 or above
• Global Coherence app: iOS 11.0 or above

Android

• HeartMath app: Android 8.0 or above
• Inner Balance app: Android 6.0 or above
• Global Coherence app: Android 5.1 or above

Packaging

• Box size: 6.5 x 3.6 x 2.03 in. (16.5 x 8.4 x 5.2 cm)
• Weight: 6.9 oz. (195.6 g)

Sensor Weight

• Pod: 1.1 oz.
• Ear sensor: 0.4 oz.
• Total: 1.5 oz.

Sensor Dimensions

• Ear clip without cable: 1.25 in. (3.2 cm)
• Ear clip with cable: 19.5 in. (49.5 cm)
• Pod: 2.75 x 0.75 x 1.125 in. (7 x 1.9 x 2.9 cm)
• USB-C cable: 4 ft. (122 cm)

Includes

• Sensor pod
• Ear clip
• Ear cable
• USB-C charging/connector cable
• Quick Start Guide