Firmness
How hard the erection is during a session. The app shows it as a number with a weekly trend, so you can see whether a change in habits or treatment moves it.
How it measures
How the TechRing measures erection firmness, quality and duration
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The TechRing measures erections with built-in sensors in a soft ring worn at the base of the penis, recording firmness, quality and duration during sex and the count, strength and length of erections overnight.
On the TechRing Night Guide, measurement means two modes of the same FirmTech device. During sex, the ring supports firmer, longer erections while its sensors log each session. Overnight, it records nighttime erections with no input from you. The FirmTech app turns both into an Erectile Fitness Score from 0 to 100.
What does the TechRing actually measure?
Six things, in two groups. During sex: firmness, quality and duration. Overnight: how many erections you had, how strong they were and how long they lasted. FirmTech calls firmness, quality and duration the vital signs of every session.
You can read nighttime erections as a broader health signal; the guide to what nighttime erections show explains why.
The six measurements, defined
Quality
A read on how consistent the erection is across a session. The app reports it alongside firmness so a single strong moment does not hide a session that faded.
Duration
How long the erection lasts. The app shows your average session length so you can track it over weeks.
Nighttime count
How many erections happened while you slept. FirmTech states that healthy men have 3 to 5 a night during sleep.
Nighttime strength
How firm each nighttime erection was, charted across the night in the app.
Nighttime length
How long each nighttime erection lasted. A FirmTech podium presentation at SMSNA 2024 reported shorter-lasting spontaneous erections in men with ED, measured with a penile tumescence monitoring device.
How the ring holds a reading in place
Good data starts with a ring that stays put. FirmTech engineered the TechRing with urologists to sit behind the testicles and around the base of the penis, an anatomical peno-scrotal fit. A patented hook-and-loop strap adjusts to your exact size, so pressure is firm but never too tight, and the ring does not restrict ejaculation. It is made of soft, medical-grade, latex-free elastomer and is safe to wear for up to 12 hours.
What FirmTech publishes about the sensors
FirmTech describes the TechRing sensors as medical grade and built to be worn for hours. Its product pages do not publish a technical sensor specification. For the clinical detail, start with the 2025 paper Wearable penile devices: the TechRing in Translational Andrology and Urology.
How at-home sensing is studied
Researchers outside FirmTech are testing how well wearable sensors detect night-time erections. One feasibility study in BJUI Compass reported: "Furthermore, visual detectability was feasible for 80% of the erections with LRH values and 90% with the temperature output." That study is not a TechRing study. Details are on the research page.
From ring to app: what happens after a session or a night
Step 1: The ring records
Sensors log the session or the night while you wear it, with nothing to press.
Step 2: You sync
After a night, hold the button for 3 seconds, put it on the charger and connect in the app.
Step 3: The app scores
Each session and night rolls into your Erectile Fitness Score, from 0 to 100.
Step 4: You add context
Log sleep, drinks, workouts and medication so the app can show what moves your numbers.
Common questions
See all 45 questions on the FAQ page- What does the TechRing measure?
- The TechRing measures erection firmness, quality and duration during sex, and the count, strength and length of nighttime erections while you sleep. The FirmTech app rolls everything into an Erectile Fitness Score from 0 to 100, plus insights on what affects it, such as sleep, drinks, workouts and medication you choose to log.
- What is the Erectile Fitness Score?
- The Erectile Fitness Score is one number from 0 to 100 in the FirmTech app that rolls up every session and every night you record with the TechRing. It lets you see your trend at a glance. Log habits like sleep, alcohol and exercise, and the app shows which ones move your score.
- How accurate is the TechRing?
- FirmTech publishes its research rather than a single accuracy figure. A 2025 paper in Translational Andrology and Urology covers the TechRing, and a clinical trial comparing it with RigiScan, the clinic standard, has 35 men enrolled. FirmTech reports more than 308,000 erections analyzed. The research page lists the published studies.
- Does the TechRing also work during sex?
- Yes. Worn during sex, the TechRing applies gentle, even pressure at the base that slows blood from flowing back out, so erections are firmer and last longer. At the same time its sensors record firmness, quality and duration. It works solo or with a partner and does not restrict ejaculation.
- How long does the TechRing battery last?
- The TechRing battery lasts up to 12 hours on a full charge, which covers a full night of sleep. It charges with the included USB charger, and a full charge takes 2 to 4 hours. Charging it during the day means it is ready to wear at bedtime.
- How do I wear the TechRing overnight?
- Put it on before bed the same way you wear it during sex: one loop under the testicles and one around the base of the penis, adjusted for comfort. It tracks on its own while you sleep. In the morning, hold the button for 3 seconds, put it on the charger and connect in the app to sync the night.
Back to the main guide: nighttime erections tracking with the TechRing.
Ready to see your nights?
The TechRing is $275 from FirmTech, with free discreet shipping on orders over $100 and a 30-day money-back guarantee.