Smartwatch Health Features Explained: What Heart Rate, ECG, Blood Pressure and Temperature Tracking Actually Do

Smartwatch health features have gone from step counters to a full dashboard on your wrist — but the feature lists can read like alphabet soup. Heart rate monitoring, ECG, blood pressure, blood oxygen, body temperature, sleep tracking: what do these functions actually do, and which ones will you use? This guide explains each feature in plain English, using the listed functions of one of our best-selling models, the W11, as the example — so you can decide if a health-focused smartwatch fits your life.

Heart Rate Monitoring: The Foundation Feature

Heart rate monitoring is the core of almost every health smartwatch. Using sensors on the back of the case that sit against your wrist, the watch tracks your pulse during workouts, rest, and daily activity. Why it matters: your heart rate shows how hard you are working during exercise, how you recover afterward, and what your resting patterns look like over time. For most buyers, this single feature — plus step counting — is what they check every day.

ECG, Blood Pressure and Blood Oxygen Functions

The W11's full name lists its headline functions: blood sugar testing, ECG, blood pressure, heart rate, and body temperature. Beyond heart rate, its product listing includes blood pressure measurement and blood oxygen detection among its functions. In plain terms, these are sensor-based functions built into the watch that let you take spot readings and follow trends from your wrist, rather than reaching for separate devices for every check. For data-minded wearers — and especially for older adults who like keeping an eye on their daily numbers — having these functions in one place, on a device you already wear, is the whole appeal.

Body Temperature and Sleep Monitoring

Body temperature measurement, also listed on the W11, lets the watch take temperature readings from the wrist as part of its health dashboard. Sleep monitoring works passively overnight: the watch tracks your sleep session so you can review how long you slept and how your nights trend over time. Together with step counting, these features turn the watch into a quiet background diary of your daily rhythm — activity by day, rest by night.

The Everyday Smart Features Around the Health Ones

A health smartwatch still has to be a good smartwatch. The W11's listing includes a touchscreen with IPS display and touch-button operation, Bluetooth calling, smart reminders, remote-control selfie and photographing functions, and a waterproof rating for daily wear, in Star black and dark gray color options. Battery life is listed at 7–14 days — a genuine quality-of-life feature, because a health watch only helps you if it is on your wrist instead of on a charger.

Meet the W11 — $117.66

The W11 Blood Sugar Testing ECG Blood Pressure Heart Rate Body Temperature Smart Watch is where all of the above comes together: heart rate monitoring, blood pressure and body temperature functions, blood oxygen detection, sleep monitoring, and step counting, wrapped in an everyday smartwatch with Bluetooth calling and a 7–14 day listed battery life. At $117.66, it is the most feature-dense watch in our best-selling collection — and a popular gift for parents and grandparents who want their health numbers close at hand.

One important note: the W11 is a consumer wellness smartwatch, not a medical device. Its readings are for personal tracking and general information only and are not a substitute for professional medical care, diagnosis, or treatment. Always consult a qualified healthcare provider about your health.

Prefer a Classic Watch Instead?

Not everyone wants a screen. If you like your technology invisible, our best-selling classic — the Stylish Classic Leather Strap Quartz Watch ($85.53) — offers timeless analog style with a Japanese CITIZEN movement, and our full lineup covers business, waterproof, and statement styles too.

Shop the Best-Selling Watches

Smart or classic, every watch in this guide lives in the Best-Selling Watches collection — the six watches L&Co customers buy most, from $22.85 everyday pieces to the feature-packed W11. Shop the Best-Selling Watches and choose the one that fits your wrist — and your life.