Know the hits that matter.
Some impacts are easy to recognize. Others leave you unsure what happened. Phreno records what its helmet-mounted sensor measured, giving you data to review and share without replacing symptoms or clinical judgment.
From impact to insight.
Thirty seconds on Noggin and the Phreno app, from the moment of a hit to the call you make next.
One sensor. Multiple sports.
Designed for compatible ski, football, baseball, lacrosse, biking, and hockey helmets. Check the helmet manufacturer’s guidance before attaching any external device.
The hits you can’t call.
Impacts do not announce whether someone is injured. Symptoms can follow a reading that looks unremarkable, and a high reading is not a diagnosis. Phreno adds a time-stamped device measurement to the context you can review and share.
Phreno won’t tell you whether you have a concussion. It records motion measured at the helmet. If symptoms follow an impact, stop the activity and seek qualified medical care regardless of the reading.
Sources: 1 Harmon et al., Br J Sports Med (2013) · 2 Tator, CMAJ (2013)
From impact to insight in milliseconds.
Mount it
The sensor attaches to the outside of a compatible helmet. Follow the helmet manufacturer’s guidance before mounting an external device.
It records detected impacts
The accelerometer and gyroscope record linear acceleration and rotational motion when the device detects an impact.
You get the alert
The Phreno app flags readings that cross your configured alert line and keeps detected impacts in the session record.
Your head, quantified.
The sensor does the measuring. The app organizes scores, prior readings, alerts, and trends so you can review what the device recorded over time.
Illustrative app previews
One score for recorded impact load
A summary score for device-recorded impacts over time. It is context for review, not medical clearance or a diagnosis.
Each recorded session, in one place
Skiing, football, lacrosse: each session is logged with its own detected-impact timeline and device measurements.
Trends, not just numbers
Prior readings and derived insights surface measurement changes for review without assigning a medical meaning.
The whole season, in one view.
Live alerts happen in the moment. Here's how every impact rolls up over weeks and months: totals, trends, and thresholds you can actually act on.
hits that crossed your alert line this season.
low-severity. The heavy hits stand out.
Every sport, every session, on the record.
What the research actually says.
Noggin is built on published head-impact research, so it is worth being precise about what that research shows, and where it stops.
More on how we handle data and what we will not claim: Research & Ethics and our Disclaimer.
- Injury models use both axes, so the sensor measures both.1,2
- Across more than 300,000 recorded impacts from instrumented players, the average concussive hit carried about 5,022 rad/s² of rotational acceleration against roughly 1,230 rad/s² for the sub-concussive ones. Risk models combine linear and rotational acceleration rather than reading either alone.
- There is no number that means “concussion”.1
- The same work puts the nominal injury value at 6,383 rad/s², and at that value the modelled risk of concussion is 50 percent. A coin flip, at the figure the literature treats as the reference point. Thresholds in this field are probability curves, not pass or fail lines.
- Most of it is never recorded at all.3,4
- Concussion is diagnosed clinically and may go unreported. A device record can supply additional context, but it cannot fill that diagnostic gap or establish whether an injury occurred.
And what a sensor cannot do.5,6,7
Head impact sensors have documented limits. A systematic review of 168 sensor studies found 64 percent did not confirm every recorded event with an observer or video, which the authors say may make those exposure estimates imprecise. Measurement quality varies in real use, and how a sensor is mounted changes what it records.
Noggin has not been independently validated against these methods. We publish what the device measured, not a verdict on what it means.
Engineered to disappear on your helmet.
Exterior based on CAD. Internal component shapes and layout are illustrative.
- Phreno Impact Sensor
- Adhesive helmet mount
- USB-C charging cable
- Quick-start guide
Sensitive data stays out of this storefront.
This website does not receive device impact or health data. Shopify handles checkout, and our forms send only the contact details you choose to provide. Our Privacy Policy explains how each storefront service handles that information.
Read the Privacy Policy
Phreno Impact Sensor
Mounts to compatible helmets and records linear acceleration and rotational motion for detected impacts, giving you data to review instead of a guess.
Check your helmet manufacturer’s guidance before mounting. External attachments can affect helmet certification.
- Availability is confirmed by Shopify at checkout
- Checkout is completed securely through Shopify
- Backed by our 30-day return policy
Questions, answered.
Still unsure? Reach out any time. The Phreno team is happy to help before you buy.
Will it tell me if I have a concussion?
No, and be skeptical of anything worn on a helmet that claims otherwise. Concussion is diagnosed by a qualified clinician. Phreno provides a record of the linear acceleration and rotational motion measured at the helmet, not what happened inside the head.
So what do I actually do with the number?
Use it as a record, never as clearance to continue or return to play. If symptoms follow an impact, stop the activity and seek qualified medical care regardless of the reading. A low number cannot rule out injury, and a high number is not a diagnosis.
Can I show the data to a doctor?
Yes. Each session can include a detected-impact timeline and device measurements, so you can share what the sensor recorded alongside your recollection and symptoms.
Does it fit my helmet?
Phreno uses an adhesive mount designed for compatible ski, football, baseball, lacrosse, biking, and hockey helmets. Check and follow your helmet manufacturer’s guidance before attaching an external device because attachments can affect certification.
I already have a MIPS helmet. Isn’t that enough?
They do different jobs. MIPS is a helmet technology designed to help manage rotational motion in certain impacts. Phreno records motion measured at the helmet. Neither replaces a properly fitted, certified helmet or qualified medical care.
What does it actually measure?
A ±200 g accelerometer records linear acceleration, and a gyroscope records rotational motion for detected impacts. Rotational acceleration is one factor used in published injury models, but no individual reading diagnoses or rules out injury. See the research we work from in The Science.
Is there a subscription?
No subscription is required. The Phreno app is currently free to use with the sensor. If optional paid features are introduced in the future, their price and billing terms will be shown before you are charged.
Do I need the app? Is there an Android version?
Yes. The free Phreno app is where impacts, sessions, baselines, and insights live, and the sensor pairs with it over Bluetooth. It’s iOS today. Android is on the roadmap and isn’t available yet.
Is Noggin a medical device?
No. Noggin is a performance and awareness tool that helps you understand your head-impact exposure. It does not diagnose or treat any condition. Always consult a medical professional for health concerns.
How long does the battery last?
Up to 7 days on a single charge, depending on how much you ride. It recharges over USB-C.
What’s your return policy?
You have 30 days after receiving your item to request a return. Eligibility conditions apply, including unused condition, original packaging, and proof of purchase. See our Warranty & Returns policy for the full terms and how to start a return. Warranty & Returns
Outfit the whole roster.
Equipping a team, a program, a unit, or a crew? Get roster-level impact monitoring, volume pricing, and a single point of contact. Tell us about your group and we’ll put together a plan.
- Volume pricing for teams and programs
- Roster-wide impact visibility
- Dedicated onboarding & support
Talk to us about your team
Email us about your organization, group size, and what you need.
Email our teamPhreno Impact Sensor