IDUN Technologies is an ETH Zurich spin-off from Switzerland and a pioneer in in-ear EEG. Their patented DRYODE® dry electrodes enable everyday EEG measurements directly from the ear via Guardian earbuds. Together with Mindfield, we combine central brain activity (EEG) and peripheral biosignals (EDA, HRV, EMG) into a complete psychophysiological monitoring system.

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Company Profile

Company	IDUN Technologies AG
Founded	2017, ETH Zurich spin-off
Location	Glattpark/Opfikon, Switzerland
Certification	CE certified (2024)
Awards	Forbes 30 Under 30 Europe (2018), Venture Kick
Website	iduntechnologies.com

Technology: DRYODE® & Guardian In-Ear EEG

IDUN Technologies solved a fundamental challenge in electroencephalography with their patented DRYODE® technology: Conventional EEG systems require conductive gel, extensive skin preparation, and bulky caps. DRYODE® dry electrodes are made from soft, biocompatible silicone with embedded conductive particles, delivering clinical-grade signal quality – no gel, no preparation needed.

Guardian 4 – Technical Specifications

Type	In-ear EEG earbuds
EEG Channels	2 channels (1 per ear, referential)
Sampling Rate	250 Hz
Electrodes	DRYODE® dry electrodes (patented)
Connectivity	Bluetooth Low Energy 5.4
Processor	Qualcomm S7 Sound Platform
Sensors	EEG, IMU (accelerometer, gyroscope), PPG (optional)
Audio	Integrated speakers (neurofeedback-capable)
Streaming	Lab Streaming Layer (LSL) compatible
Certification	CE certified

The compact in-ear form factor makes Guardian ideal for ambulatory EEG monitoring, neurofeedback training in home environments, and research applications outside the laboratory.

Partnership: Multimodal Biofeedback

The partnership between IDUN Technologies and Mindfield Biosystems combines two complementary approaches to psychophysiological measurement:

Complementary Signals

IDUN Guardian	Mindfield eSense & MindMaster
EEG (central/cortical, in-ear)	EDA / Skin Conductance (eSense Skin Response)
Cognitive states, sleep, attention	HRV / Heart Rate Variability (eSense Pulse)
Alpha, beta, theta activity	EMG / Muscle Tension (eSense Muscle)
	Respiration (eSense Respiration)
	Temperature (eSense Temperature)

Together, both systems enable complete psychophysiological monitoring for home training, research, and clinical applications. The technical prerequisites for integration are in place:

Bluetooth Low Energy: Both systems use BLE for wireless connectivity
Dry Electrodes: No gel preparation – ready to use immediately
Lab Streaming Layer (LSL): Guardian supports LSL; LSL integration for eSense sensors is planned
Home Training Ready: Compact, intuitive, designed for end users

Current Development: Mindfield is currently evaluating the IDUN Guardian hardware for integration into existing biofeedback workflows. The goal is a multimodal setup combining in-ear EEG with peripheral biosignals from eSense sensors and MindMaster amplifiers.

Scientific Validation

IDUN Technologies is cited in over 13 peer-reviewed publications. The in-ear EEG technology has been validated in several independent studies:

Sleep Staging: Correlation r = 0.78 with clinical PSG gold standard (Cohen’s Kappa 0.71)
Alpha Detection: Correlation r = 0.92 with conventional EEG
Cognitive Workload: 96% classification accuracy for workload detection
Additional Areas: Attention, meditation, auditory evoked potentials (AEP)

The complete publication list is available on the IDUN Science page.

Further Links