Fitbit Sense 2 Health and Fitness Smartwatch (One Size)

How accurate is the heart rate monitoring on the Sense 2?

The Sense 2 uses advanced photoplethysmography sensors for 24/7 heart rate tracking. Clinical studies show Fitbit heart rate monitors are accurate within 3-5 beats per minute during rest and light exercise. The ECG feature provides medical-grade readings for atrial fibrillation detection, though it's not a substitute for professional medical diagnosis.

Can I swim with the Fitbit Sense 2?

Yes, the Sense 2 is water resistant up to 50 metres depth. You can wear it whilst swimming, showering or in the rain. The watch automatically tracks swimming workouts and records laps, duration and calories burned. However, avoid pressing buttons underwater and rinse with fresh water after swimming in chlorinated or salt water.

How long does the battery actually last with regular use?

Battery life varies based on usage patterns. With typical use including notifications, heart rate monitoring and occasional GPS workouts, expect 5-6 days per charge. Heavy GPS use reduces this to 3-4 days. The always-on display feature significantly impacts battery life. Fast charging provides a full day's power in just 12 minutes.

What's included with the 6-month Premium membership?

The Premium membership provides detailed health insights, personalised guidance and exclusive content. You get advanced sleep analysis, workout recovery metrics, mindfulness sessions and nutrition tracking. Premium also includes guided programs for fitness goals and stress management. After 6 months, membership costs £7.99 monthly.

Is the Sense 2 compatible with both iPhone and Android?

The Sense 2 works with iOS 15 or higher and Android 9.0 or higher. iPhone users get full functionality including call answering and text replies. Android compatibility varies by manufacturer - Samsung and Google Pixel devices typically offer the best experience. Some features like voice replies may be limited on certain Android phones.

How does the stress monitoring actually work?

The Sense 2 uses electrodermal activity (EDA) sensors on the watch face to detect stress responses. These sensors measure tiny electrical changes in your skin that occur during stress. You can take manual EDA scans or receive automatic stress notifications. The watch combines this data with heart rate variability to create your daily Stress Management Score.

Can I make phone calls directly from the watch?

Yes, you can answer and make calls through the watch when connected to your phone via Bluetooth. The built-in microphone and speaker allow hands-free conversations. Call quality is clear for short conversations, though longer calls are better handled on your phone. You can also quick reply to texts with preset messages.

What happens if my Sense 2 stops syncing with the app?

Syncing issues are usually resolved by restarting both the watch and your phone's Bluetooth connection. Ensure the Fitbit app has the latest updates and that your phone's operating system meets compatibility requirements. If problems persist, try unpairing and re-pairing the device. Customer reviews mention some users experience ongoing sync issues, particularly with certain iPhone models.