Elevate Sensor

Garmin Elevate: Sensor Generations, Capabilities, and Model History

Garmin does not publish official generation numbers for its Elevate optical sensor. The “Gen 1” through “Gen 5” labels used on this page are inferred from product teardowns, patent filings, and comparisons between devices, not from Garmin’s own marketing language.

Elevate is Garmin’s proprietary optical heart rate technology, first appearing in the Forerunner 235 in October 2015. It measures heart rate using photoplethysmography: LEDs shine light into the wrist, a photodiode measures how much light returns, and the amount of light absorbed changes with each heartbeat as blood volume in the capillaries rises and falls. Garmin’s first wrist-based heart rate watch, the Forerunner 225 released three months earlier in August 2015, used licensed sensor technology from Mio Global rather than an in-house design. The commercial success of the FR225 is what pushed Garmin to develop Elevate.

How the sensor works

Green light is the basis for heart rate detection across every generation. Haemoglobin absorbs green wavelengths efficiently, which makes the pulse signal easier to isolate at the skin surface than it would be with other colours. During systole, when the heart contracts, haemoglobin density in the capillaries rises and more green light is absorbed. During diastole, density falls and more light reflects back to the photodiode. That absorption cycle is the raw heart rate signal.

Red and infrared LEDs were added at Gen 3, and they measure something green light cannot. Oxygenated and deoxygenated haemoglobin absorb red and infrared light differently, so comparing the ratio between the two wavelengths yields a blood oxygen saturation estimate. Pulse Ox did not exist on Garmin watches before this generation because the hardware to measure it did not exist either.

The sensor also runs at two different sampling frequencies. At rest, it uses a low-frequency mode to conserve battery. Once it detects increased physical activity, it switches to a higher-frequency mode for a stronger signal during movement. This is what allows continuous 24/7 monitoring without draining the battery in a day.

Elevate Gen 1 (2015)

First devices: Forerunner 235, Fenix 3 HR.

Three green LEDs with a basic photodiode. This was Garmin’s first in-house optical sensor, enabling continuous heart rate without a chest strap for the first time on a Garmin watch. Accuracy during high-intensity intervals was a known weakness, since rapid heart rate changes and motion artifacts from arm swing were harder for the early signal processing to filter out.

Elevate Gen 2 (2017)

First devices: Forerunner 935, Fenix 5 series.

The LED hardware stayed close to Gen 1: three green LEDs, similar photodiode layout. The change was in signal processing rather than components. Garmin’s algorithms improved at filtering motion artifacts from sweat, vibration, and movement in real time, which addressed the main criticism levelled at Gen 1 during running and cycling.

Elevate Gen 3 (2019)

First devices: Forerunner 945, Fenix 6 series.

Red and infrared LEDs joined the existing green array, enabling Pulse Ox blood oxygen monitoring for the first time. Overall heart rate accuracy improved alongside this, and sleep tracking gained respiration rate estimation, which is derived from subtle variations in the same optical signal rather than a separate sensor.

Elevate Gen 4 (2021 to 2022) and Gen 4.1 (2026)

First devices: Fenix 7 series, Forerunner 955, Venu 2 Plus (ECG variant).

The focus of Gen 4 was HRV tracking accuracy and lower power draw, which enabled the overnight HRV measurements that HRV Status, Body Battery, and Training Readiness all depend on. Gen 4 also introduced Garmin’s first wrist ECG hardware, on a single device: the Venu 2 Plus added an electrical isolation ring and bezel electrodes alongside the standard optical module, a physically distinct addition rather than a software feature. No other Gen 4 device carried this hardware during the generation’s run.

Gen 4.1 is a modified version of Gen 4 with skin temperature sensing added, and it ships in the 2026 Garmin CIRQA rather than the newer Gen 5. Garmin product manager Chrissy Wheeler told Forbes the decision came down to module size: the Gen 5 sensor would have made the screenless CIRQA band thicker. That explanation sits awkwardly next to the cheaper Garmin Index Sleep Monitor, which carries Gen 5 despite costing $30 less than CIRQA’s $199.99. The practical result is that Garmin now runs Gen 4.1 alongside Gen 5 rather than retiring the older sensor outright, using it in devices where battery life or thinness matters more than the newest hardware. See Garmin Elevate 4.1: two sensors going forward for the full analysis of what this stratification means for cheaper Garmins going forward.

Elevate Gen 5 (2023 to present)

First devices: Fenix 7 Pro, Epix Pro (Gen 2).

Teardowns show six green LEDs, two red or orange LEDs, and four photodiodes, surrounded by the electrical isolation ring that enables ECG. ECG support expanded to more devices under Gen 5, though not universally, since the feature still requires per-market regulatory clearance on top of the hardware and the bezel electrodes. The Forerunner 570 is a clear example: it carries Elevate Gen 5 but has no ECG feature, because Garmin never added the electrodes to that model. Accuracy improved during dynamic movement such as weightlifting and CrossFit, and skin temperature sensing was added to the module. See New Garmin Elevate Gen 5 for the sensor’s launch-day teardown analysis.

Gen 5 has since carried forward into the Fenix 8, Venu 3 and Venu 4, Forerunner 570, and both the Fenix 9 and Fenix 9 Pro, launched in August 2026. Despite widespread pre-launch expectation of a Gen 6 debut on the Fenix 9, Garmin kept Gen 5 unchanged. As of August 2026, Gen 5 remains Garmin’s current flagship sensor, three years after its introduction.

ECG: on demand, not passive

Every Garmin ECG feature, on Gen 4 or Gen 5 devices, works the same way: the wearer touches the bezel electrodes and holds still for roughly thirty seconds to record a single reading. It is a spot check triggered by the user, not continuous background monitoring. That matters because the value of ECG for catching something like atrial fibrillation depends heavily on whether it is watching all the time or only when someone remembers to ask it to. An irregular rhythm that appears for two minutes at 3am produces nothing on a Garmin, because nobody is awake to trigger the reading.

Fourth Frontier’s chest strap approach solves this differently: passive, continuous ECG monitoring throughout the day rather than an on-demand snapshot, which is what genuinely useful arrhythmia detection needs. The trade-off is the form factor, a chest strap rather than a watch, and it illustrates the gap between what Garmin’s wrist hardware currently does and what continuous ECG monitoring would require. Whether a future Elevate generation moves toward passive rhythm detection, rather than the on-demand model every generation has used so far, is the single most-cited expectation for Gen 6.

Elevate Gen 6 (unreleased)

Garmin’s roughly two-year cadence between generations would have suggested a 2025 arrival. That has not happened. Speculation centres on passive, continuous irregular heart rhythm notification without a manual trigger, better accuracy during high-motion activity, improved SpO2 and respiration estimates, and possibly blood pressure trend estimation. None of this is confirmed, and it is presented here as speculation rather than pending fact. See Garmin Elevate 6: how Garmin will increase the accuracy of wellness sensors and Garmin Elevate 6: accuracy boost from new sensing tech for the patent evidence behind these expectations.

Garmin’s expertise in near-infrared sensing extends beyond the wrist. A future muscle oxygen sensor, following the direction suggested by the Muscle Battery trademark, would need to be a separate device worn directly over the target muscle rather than a new Elevate generation, since the wrist is the wrong location for that measurement. See Garmin next-gen sensors: 2026 onwards for what that device might look like.

What each generation senses

Heart rate: every generation, from the green-light absorption cycle described above.

HRV, Body Battery, stress, and Training Readiness: software built on top of continuous heart rate sensing, refined at Gen 4 specifically for overnight accuracy.

Pulse Ox and respiration rate: Gen 3 onward, derived from the red and infrared absorption ratio.

Skin temperature: Gen 4.1 onward.

ECG: a distinct hardware addition, present on select Gen 4 and Gen 5 devices only, and only where the watch also has bezel electrodes and regulatory clearance in the user’s market. Carrying the sensor generation is necessary but not sufficient for the feature to be present, and even where it is present, it is an on-demand reading rather than continuous monitoring.

Accuracy considerations

Fit affects every generation: the watch needs to sit snugly above the wrist bone for reliable contact. Very dark skin tones and tattoos can affect light absorption. Cold reduces blood flow to the extremities and weakens the signal. Sweat introduces noise. High-intensity intervals can lag slightly behind actual heart rate during rapid changes, and wrist-flexing exercises such as push-ups or deadlifts can introduce motion artifacts regardless of generation. Garmin recommends a chest strap such as the HRM-Pro Plus or HRM 600 for training where accuracy matters most.

This page is part of the Garmin Hardware section, covering the physical components behind Garmin’s watches.

Quick answers

What is Garmin Elevate?
Elevate is Garmin’s proprietary optical heart rate sensor, first introduced in 2015. It uses photoplethysmography, shining light into the wrist and measuring how much reflects back, to detect heart rate without a chest strap.


Does Garmin publish official Elevate generation numbers?
No. Garmin has never officially named Elevate generations. The Gen 1 through Gen 5 labels used across this site and elsewhere are inferred from teardowns and device comparisons.


What is the difference between Elevate Gen 4 and Gen 4.1?
Gen 4.1 is a modified Gen 4 with skin temperature sensing added. It ships in the Garmin CIRQA rather than the newer Gen 5, reportedly to keep the band thinner.


Which Garmin watches have Elevate Gen 5?
Fenix 7 Pro, Epix Pro Gen 2, Fenix 8, Venu 3, Venu 4, Forerunner 570, and the Fenix 9 and Fenix 9 Pro all carry Elevate Gen 5.


Does having Elevate Gen 5 mean a watch has ECG?
No. ECG needs bezel electrodes in addition to the Gen 5 module, plus regulatory clearance in the user’s market. The Forerunner 570 has Gen 5 but no ECG feature.


Is Garmin's ECG continuous or on demand?
On demand only. The wearer touches the bezel electrodes and holds still for around thirty seconds to record a single reading. It does not monitor continuously in the background.


Has Elevate Gen 6 been released?
No. As of the Fenix 9 launch in August 2026, Garmin has kept Gen 5 for three years past its introduction. Gen 6 remains speculation, not a confirmed product.

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