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If you are a Study Participant, contact your Administrator directly as information in the Support Center is intended for qualified researchers and healthcare professionals. Misapplying the information below may affect your data collection.

Thank you for using the E4

As of February 14th, 2025, the E4 and its software suite have officially been sunset. Click here for more information.
If you are looking for a wearable research solution, explore the Empatica Health Monitoring Platform.

How Tagged Events Data Looks in the Raw Data

By pressing either side button for 1 second, EmbracePlus allows the participant to create an Event Tag.
More information about Tagging Events is available in the following article: Tagging Events with EmbracePlus

Tags are then found in their respective Avro file under rawData>tags in the tagsTimeMicros array.

{
    "rawData": {
        "tags": {
            "tagsTimeMicros": [
                1702396205010249,
                1702396808002192
            ]
        }
    }
}

Each Tag is a microsecond UNIX timestamp in UTC+0 format.

More information about Avro files and how to access them can be found in the following article: How to access Avro files with Python

The article includes an example Python script to convert Avro into CSV. Tags are then found in the tags.csv file.