Because it’s the calm your night deserves,
but not the one you expected right now.
And so it works in silence.
Because your mind can rest.
Because it’s not a medicine.
It’s a silent guardian,
a restorative protector...
The Dark Light.
BeCozU
The Dark night in the Silence
Sleeplessness works nights.
Not vanishing into the shadows,
but guiding you through the dark into the light.
13g Featherweight
Designed for Silent Comfort.
The best protection is the kind you forget is there. An in-ear insert with a speaker inside, shaped to rest in the ear without asking for your attention. Ear tips come in two sizes, so the fit is yours rather than an average.
13 grams in the ear. The left side carries the electrode, the right side the PPG sensor, and both carry a speaker. The device that does the work can also play what you fall asleep to.
Earbud Weight
13g
Cradle Weight
93g
Bluetooth
5.3
Safe & Non-Invasive
Gentle micro-currents.
Profound biological calm.
It doesn’t sedate you and it doesn’t overpower you. taVNS sends micro-electrical pulses through the auricular branch of your ear, aimed at the one nerve that can stand your body down.
10 levels, yours to choose
Stimulation in the 0.5 – 2.0 mA range
For most adults the perception threshold of electrical current is below 5 mA. taVNS devices operate within 0.5 to 2 mA, a range considered safe at the cellular level, and the penetration depth into tissue is shallow.
From the ear the signal carries on to the brainstem nuclei, where the body releases its own calming neurotransmitters: GABA and serotonin.
Where the nerve comes close
The Auricular Branch
Transcutaneous auricular vagus nerve stimulation reaches the vagus nerve at the ear, where it runs close enough to the surface to be touched without surgery. It is a safe and gentle alternative, using electrical impulses through the skin, with minimal side effects.
The electrode sits on the left earbud, its contacts resting against the outer ear. You choose the intensity across 10 levels. Start low, and raise it only if you want to.
1. Auricular Vagus Nerve
The electrode sends impulses through the skin of the ear to the auricular branch of the vagus nerve.
2. Brainstem Nuclei
The signal reaches the brainstem nuclei, easing the excessive sympathetic responses behind tension.
3. GABA & Serotonin
GABA promotes sleep and induces calming effects. Serotonin facilitates sleep and helps reduce anxiety.
One acts. One measures.
Two ears. Two duties.
The left ear does the work, in silence. The right ear reads your heart while it happens, so you can see the session and not only feel it.
Left Ear: Active taVNS
Neuro-Stimulation Core
Positioned to meet the auricular branch of the vagus nerve in the left ear, the side where taVNS is felt as a gentle flow of energy.
Electrode contacts that rest against the outer ear
10 customizable intensity levels for personalized comfort
A single 30-minute session, start to finish
Right Ear: PPG Biometrics
Optical Bio-Sensor
Carries a PPG optical sensor that reads your heart rate. Take it out and touch the sensor: the green light means it is working.
Reads your heart rate for as long as the session runs
Average heart rate and a session-by-session graph in the app
The session ends on its timer, or the moment it returns to the cradle
Smart Companion App
Total Control & Daily Tracking.
The app keeps the record: your stimulation history, the heart rate the PPG sensor read while it ran, and the score you give the night yourself when you wake up.
Core Innovations
Quiet power in every element.
Every gram, every minute, every milliamp was decided by one question: will you notice it working?
Featherweight Comfort
13g
So light and discreet, you will forget you are wearing it as you drift into dreamland.
A Fixed Session
30min
The timer ends it. Put the earbud back in the cradle and it ends there and then.
Mood Light Cradle
93g
USB-C at DC 5V 1A, about 4 hours to full. The cradle carries a warm mood light.
Bluetooth 5.3
Pair the earbuds in your phone’s Bluetooth settings first, then connect inside the app. iOS and Android both.
No Surgery, No Pill
Non-invasive and non-pharmacological: no incision, nothing to swallow, just a gentle current through the skin.
Something to Fall Asleep To
No nightstand speaker, no headphones to keep on all night. The earbud already in your ear plays the sound too.
It Remembers Your Bedtime
A reminder, not an alarm. It waits for the bedtime you set yourself, then nudges you before the night gets away from you.
Not a miracle. A method.
Backed by neuroscience.
It was never going to be the dramatic answer. Peer-reviewed research on transcutaneous auricular vagus nerve stimulation points to something quieter and more useful: a shift toward parasympathetic activation.
“
…taVNS interventions resulted in reduced stress levels, improved sleep quality, and enhanced perception of stress.
Frontiers in Psychology
— dos Reis et al. (2024)
“
Overall, these findings demonstrate a favorable safety profile of taVNS… supporting its use as a suitable non-invasive tool in both research and clinical applications.
Frontiers in Human Neuroscience
— Giraudier et al. (2025)
“
Participants in the repeated session protocol increased their HRV, cognitive performance, and sleep efficiency. In particular, taVNS induced higher parasympathetic activation.
Frontiers in Neurology
— Le Roy et al. (2023)
“
The promising results underscore taVNS as a potential neuromodulatory intervention for anxiety-related conditions.
Frontiers in Integrative Neuroscience
— Ferreira et al. (2024)
* While inspired by taVNS technology, BeCozU is a wellness device and not intended to diagnose, treat, cure, or prevent any disease. Effects vary from person to person.
Specifications
Technical Details
Every number it operates on, on the record.
Dimensions & Weight
Earbud: 1.1 × 1.5 × 1.0 in (13g each)
Charging Cradle: 2.4 × 3.5 × 1.8 in (93g)
Charging Cradle: 2.4 × 3.5 × 1.8 in (93g)
Stimulation
Transcutaneous Auricular Vagus Nerve Stimulation (taVNS), left earbud
10 intensity levels, set in the app
30-minute session
taVNS devices operate at 0.5 – 2 mA
10 intensity levels, set in the app
30-minute session
taVNS devices operate at 0.5 – 2 mA
Sensor & Connectivity
Heart rate via optical PPG sensor, right earbud
Bluetooth 5.3
iOS and Android app
Bluetooth 5.3
iOS and Android app
Battery & Charging
DC 5V 1A via USB-C
Full charge time: approx. 4 hours
Full charge time: approx. 4 hours
Audio
Built-in speaker
Sleep music library, played through the earbud
Sleep music library, played through the earbud
Account & Pairing
One device per person
Two-step pairing: your phone’s Bluetooth first, then the app
Firmware updates through the app
Two-step pairing: your phone’s Bluetooth first, then the app
Firmware updates through the app
What’s in the Box
BeCozU Earbuds (L/R)
Charging Cradle
Ear Tips (2 sizes)
USB-C Cable
User Manual & Warranty
The Dawn Is Waiting
Step into the dark.
Wake up to the light.
It never vanishes into the shadows.
It walks through them
so you reach the morning.