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1Scan for outdated or missing drivers - takes under a minute2Repair Windows errors before they cause bigger problems3Fix the driver behind crashes, sound loss and screen glitchesPixel Watch 3 can detect a possible loss of pulse, check whether the wearer is responsive, and attempt to call emergency services if there is no response. Google calls the feature Loss of Pulse Detection. It is a significant safety differentiator, but it is not a guarantee of detection, connectivity or rescue—and it is not the same as a medical diagnosis.
What Loss of Pulse Detection actually does
Loss of Pulse Detection uses the Pixel Watch’s optical heart-rate sensors, motion sensors, signal processing and machine-learning software to look for a possible disappearance of pulse-related signals while the wearer is still. Possible causes could include cardiac arrest, respiratory or circulatory failure, overdose or poisoning, but the watch does not determine the cause or diagnose a condition. Google’s description is a detection-and-escalation workflow, not a clinical diagnosis. Google’s support documentation and the FDA filing describe the system’s operation and limitations.
The feature debuted with Pixel Watch 3 in 2024, reached the United States after Google announced FDA clearance on February 26, 2025, and is now also documented for Pixel Watch 4. This article focuses on Pixel Watch 3, but it is no longer exclusive to that generation. Google’s FDA announcement
What happens after the watch suspects a loss of pulse
- Detection: The watch detects that it cannot find a pulse signal while its motion data indicates that the wearer is still.
- Check-in: It vibrates and displays a full-screen prompt asking the wearer to respond.
- Automatic dismissal: If the watch detects movement or a pulse, the check-in may clear without an emergency call.
- Alarm and countdown: After approximately 15 seconds, Google says the watch sounds a louder alarm and starts an emergency countdown. The wearer can cancel it using the on-screen control.
- Emergency call attempt: If nobody cancels the countdown, the watch attempts to contact emergency services.
- Automated information: If the call connects, an automated message says that the watch detected a possible loss of pulse and that the wearer did not respond. The message can include the wearer’s location.
- Human intervention: The wearer or a bystander can interact with the watch to stop the automated message and speak with the emergency operator.
That means “automatically calls emergency services” should be read literally as an attempt after an unanswered check-in. It does not guarantee that a call connects, that an ambulance is dispatched, or that the location is received correctly.
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- The Google Pixel Watch 3 is designed for performance, with advanced fitness from Fitbit[1,2]; the 45mm screen is twice as bright and 40% larger than before, making it easier to see your stats and info[1]
- Maximize your performance with advanced running features; build custom run workouts and get real-time guidance and advanced form tracking[3]
- Enhance your run routine with Fitbit Premium; Google AI uses your goals, past runs, and readiness to power personalized run recommendations[3]
- Know what your body is ready for each day with readiness; it uses sleep, resting heart rate, and heart rate variability to show if you’re ready to take on a workout or prioritize recovery[3]
- Cardio load measures how hard your heart works so you can see how hard you’ve pushed; compare trends to see if you’re under- or over-training[3]
Why this is different from Apple Watch heart monitoring
Heart-rate measurement, irregular-rhythm notifications and an ECG are not the same function as detecting a possible loss of pulse and escalating after the wearer fails to respond. Apple documents those heart features, but its current Apple Watch safety documentation does not list an equivalent loss-of-pulse-to-emergency-call workflow. Apple’s heart-health documentation · Apple Watch safety documentation
| Capability | Pixel Watch 3 | Apple Watch |
|---|---|---|
| Possible loss-of-pulse detection with escalation | Documented Loss of Pulse Detection | No equivalent listed in Apple’s current safety documentation |
| Fall Detection | Available | Available |
| Crash Detection | Available | Available |
| Emergency SOS and manual calling | Available, subject to connection and region | Available, subject to model, connection and region |
| Irregular-rhythm notifications | Available on supported configurations | Available on supported models and regions |
| ECG | Supported models and regions | Supported models and regions |
| Satellite safety functions | Model and region dependent | Supported Ultra models and regions |
As of August 18, 2026, the defensible comparison is narrow: Google documents a Pixel workflow for a possible loss of pulse followed by an unanswered check-in and an emergency-call attempt; Apple does not currently advertise an equivalent feature. That is not a claim that Apple sensors cannot measure pulse changes or that Apple cannot add the function later. Apple may be the stronger choice for a particular buyer because of Fall Detection, Crash Detection, Medical ID, iPhone integration or satellite-related features.
Availability, phone and connection requirements
Supported watch and phone
Google documents the feature on Pixel Watch 3 and Pixel Watch 4. Pixel Watch 3 requires a phone running Android 10 or newer and does not support iPhone. Google’s compatibility requirements
Wi-Fi/Bluetooth model
A Wi-Fi Pixel Watch must be near its paired phone and connected over Bluetooth. The phone must be charged, connected and capable of placing the emergency call. Without that link, the wearer cannot directly speak to emergency services through the watch.
LTE model
An LTE Pixel Watch 3 can call without a nearby phone only when it has an active LTE connection. Depending on the country, that may require a carrier plan or Google’s Safety Signal support. In the United States, Google lists AT&T FirstNet, Cellcom, CSpire, Google Fi, T-Mobile, UScellular, Verizon and Xfinity among compatible Pixel Watch 3 LTE operators; carrier support can change, so verify your exact plan before buying. Carrier and compatibility list
Rank #2
- The Google Pixel Watch 3 is designed for performance, with advanced fitness from Fitbit[1,2]; the 41mm screen is twice as bright and 10% larger than before, making it easier to see your stats and info[1]
- Maximize your performance with advanced running features; build custom run workouts and get real-time guidance and advanced form tracking[3]
- Enhance your run routine with Fitbit Premium; Google AI uses your goals, past runs, and readiness to power personalized run recommendations[3]
- Know what your body is ready for each day with readiness; it uses sleep, resting heart rate, and heart rate variability to show if you’re ready to take on a workout or prioritize recovery[3]
- Cardio load measures how hard your heart works so you can see how hard you’ve pushed; compare trends to see if you’re under- or over-training[3]; and receive a daily target based on cardio load and readiness levels
Region and travel
Loss of Pulse Detection is region-limited. Google says it is temporarily suspended when the wearer travels into an unsupported region and resumes after returning to a supported one. Regulatory clearance, emergency-call infrastructure, language support and carrier arrangements all affect availability. A watch purchased in the United States is not guaranteed to work worldwide.
How to enable or disable it
Enable Loss of Pulse Detection
- Open the Google Pixel Watch app on the phone.
- Tap Safety & emergency.
- Tap Loss of Pulse Detection.
- Complete the on-screen setup.
The feature is opt-in and off by default in the FDA filing. If the option is missing in a supported region, update the Personal Safety app on the watch and the Pixel Watch app on the phone. FDA filing
Turn it off
- Open the Google Pixel Watch app.
- Tap Safety & emergency.
- Tap Loss of Pulse Detection.
- Tap the slider beside Use Loss of Pulse Detection.
If an accidental call starts
Do not simply hang up. Tell the emergency operator that the call was accidental and that no assistance is needed, following Google’s guidance. Do not stage a fake loss-of-pulse event to test the system; check ordinary phone, Bluetooth, LTE and emergency-calling connectivity instead.
Limitations that matter in real use
False check-ins
Google warns that poor sensor contact during normal activity can trigger a check-in. A loose fit, unusual movement or other contact problems can make the optical reading unreliable. Wear the watch as instructed, but understand that good fit cannot eliminate false alarms.
Missed events
Google and the FDA explicitly state that the system may not detect every loss-of-pulse event. A missing alert does not prove that no emergency occurred. The FDA filing also says the relevant data are captured when the user is still, so this is not continuous clinical monitoring.
Rank #3
- The Google Pixel Watch 3 is designed for performance, with advanced fitness from Fitbit[1,2]; the 45mm screen is twice as bright and 40% larger than before, making it easier to see your stats and info[1]
- Maximize your performance with advanced running features; build custom run workouts and get real-time guidance and advanced form tracking[3]
- Enhance your run routine with Fitbit Premium; Google AI uses your goals, past runs, and readiness to power personalized run recommendations[3]
- Know what your body is ready for each day with readiness; it uses sleep, resting heart rate, and heart rate variability to show if you’re ready to take on a workout or prioritize recovery[3]
- Cardio load measures how hard your heart works so you can see how hard you’ve pushed; compare trends to see if you’re under- or over-training[3]
Connectivity and power failures
- Dead watch or phone battery.
- Disconnected Bluetooth link on a Wi-Fi model.
- No active LTE plan or weak cellular coverage.
- The phone is already occupied by another call.
- Unsupported country or carrier.
- Emergency services cannot receive the call or location correctly.
Medical and age restrictions
The feature is not intended for people under 22 or for people already identified as high risk for sudden cardiac death, including certain users with coronary artery disease, cardiomyopathy or unexplained fainting. It is not a replacement for a prescribed ECG, implanted monitor, professional monitoring service or medical-alert system. Follow a clinician’s advice where specialized monitoring is required. Google’s limitations and safety guidance
The watch must be worn
It cannot monitor someone who has removed the watch or left it charging. Consistent wear and regular charging are prerequisites, not optional extras.
Health-data privacy
Google says data associated with the feature may be collected and stored on Google servers for safe and effective operation, and says it will not sell that data or use it for advertising. That policy may matter to buyers making a health-data decision.
Who should consider Pixel Watch 3?
Potentially good fit
- Android users who already wear and charge a smartwatch consistently.
- People who exercise or spend time alone and want an additional emergency-safety layer.
- Families seeking another safeguard for an adult relative who can use the watch reliably.
- Buyers who can verify regional support and maintain a compatible LTE plan when phone-free calling matters.
Poor fit
- iPhone owners.
- People in unsupported countries or with incompatible carriers.
- Anyone expecting guaranteed, continuous clinical monitoring.
- Users who will not wear, charge or maintain the watch.
- People who need dedicated caregiver response, two-way voice support or a purpose-built medical-alert service.
- Intended wearers under 22 or in an excluded high-risk medical category.
Wi-Fi or LTE: which configuration makes sense?
The 41mm and 45mm case sizes do not change the core safety feature. The important choice is connectivity. Wi-Fi/Bluetooth is adequate when the paired phone stays nearby, charged and connected. LTE is the more appropriate configuration for walks, runs or other situations in which the wearer may leave the phone behind, but it requires compatible service and may add recurring fees. Confirm carrier support and emergency-calling behavior in your country before purchase. Pixel Watch 3 product page
Bottom line for buyers
Pixel Watch 3’s Loss of Pulse Detection is a meaningful, narrowly defined advantage: it can look for a possible loss of pulse, ask for a response and attempt an emergency call when the wearer does not respond. Apple Watch’s published safety list does not currently document that same workflow, although Apple offers strong fall, crash, SOS, medical-identification and satellite-related tools in supported configurations.
Buy the Pixel Watch 3 for this feature only if the entire chain works for you: Android 10 or newer, a supported region, reliable wear and charging, and either a nearby connected phone or an active compatible LTE service. Treat it as an extra safety layer—not a guarantee, diagnosis or substitute for professional medical monitoring.
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