The device
A handheld photobiomodulation device designed for contact-based use
Near-contact geometry. Individually calibrated output. Session-level validation on every use.
Form factor
Sized for contact. Designed to stay there.
The Rejuv is sized for stable single-hand contact over a defined 20 cm² treatment aperture. Weight and dimensions support sustained use across a full session without requiring a mount or stand.
The handheld format is deliberate. Contact-based geometry makes irradiance delivery repeatable. Panel-based systems operate at distance and assume consistent positioning — this device removes that assumption.
Optical system
Measured at the surface. Not extrapolated from a distance.
The device emits at 660 nm (red) and 805 nm (near-infrared) across a 20 cm² contact aperture. Output is measured and published under the geometry in which the device is actually used: near-contact application.
Irradiance values are not derived from idealized test distances. Measured electrical input and irradiance data — including per-unit calibration records — are available on the Measured Performance page.
View measured performance →Interaction model
One button. No configuration required.
The device is controlled by a single button. Mode parameters can also be configured via the app, but operation does not require it.
Session data — operating mode, output state, duration, and contact quality — is recorded locally throughout operation. At session end, bring the device near your phone.
Typical session
From contact to record in five steps
Companion app
Session telemetry on your phone
The Rejuv app retrieves session data from the device via NFC tap. No background connectivity or account required.
- —Dynamic Optical Response chart — contact stability visualized throughout each session
- —Session history with mode, duration, and quality index per session
- —Calendar view of usage patterns over time
- —Dose targeting in development — set J/cm², app calculates session time from your unit’s calibration
Dynamic Optical Response
Session calendar
Built for reproducibility
Contact quality is measured. Not assumed.
Contact quality is measured continuously via reflected optical signal at the aperture — not inferred from user compliance.
Each session generates a normalized quality index derived from operating consistency, mode selection, contact behavior, and duration. Sessions are timestamped and stored, allowing protocol adherence to be tracked across time.
Measured device performance is published. Session conditions are logged. Electrical input, irradiance, duration, and geometry can be reconciled.
Manufacturing
Small batches. Individual calibration.
Current units are produced in small batches. Enclosures are fabricated via additive manufacturing; electronics are assembled and tested individually. This approach prioritizes iteration speed and direct traceability over cosmetic uniformity.
Each unit is individually calibrated prior to shipment using a NIST-traceable optical power meter. A calibration certificate documenting measured irradiance, output stability, and sensor uncertainty ships with every unit.
Minor visual variation reflects the fabrication process, not a deviation from specification.
Summary specification
| Wavelengths | 660 nm (red), 805 nm (near-infrared) |
| Treatment area | 20 cm² contact aperture |
| Operating modes | Red only, NIR only, combined |
| Session duration | User-configurable (2–10 minutes typical) |
| Charging | Qi wireless and USB-C |
| Session logging | Automatic; NFC retrieval, no account required |
| Thermal management | Passive — no active cooling, no required cooling interval |
| Contact sensing | Optical reflection measurement, continuous |
| Calibration | Individual NIST-traceable measurement; certificate included |
| Assembly | Small batch; enclosure via additive manufacturing |
Early-access pilot — May 2026
A small number of units will go to participants willing to provide structured feedback on usability and performance.