Fitbit Sense 2 (Shadow Grey/Graphite, One Size)

How accurate is the ECG feature compared to medical equipment?

The ECG app uses medical-grade sensors that meet FDA standards for consumer devices. It can detect atrial fibrillation with clinical accuracy when used correctly. However, it's designed for personal monitoring rather than medical diagnosis. The 30-second reading provides reliable data for tracking heart rhythm patterns, but any concerning results should be discussed with healthcare professionals.

What is the actual battery life with all features enabled?

Battery life varies significantly based on usage patterns. With GPS, always-on display and continuous health monitoring active, expect 2-4 days of use. Standard usage with periodic GPS and health tracking typically achieves 4-5 days. The advertised 6-day battery life requires minimal feature usage and reduced screen brightness settings.

Can I use this watch without a smartphone connection?

The watch functions independently for fitness tracking, heart rate monitoring and GPS recording. However, smartphone connectivity is required for data synchronisation, app downloads and receiving notifications. Weather updates, music control and detailed health insights require active Bluetooth connection to your phone and the Fitbit app.

Is the stress detection feature actually useful for daily life?

The cEDA stress detection technology measures skin conductance changes that correlate with stress responses. It provides objective data about stress patterns throughout the day, helping identify triggers and peak stress periods. The feature includes guided breathing exercises and mindfulness reminders when elevated stress is detected, making it practically useful for stress management.

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

Premium membership provides advanced sleep insights, personalised workout programmes and detailed health trend analysis. You'll access exclusive mindfulness sessions, nutrition tracking tools and advanced sleep coaching. The membership includes detailed health reports, goal-setting guidance and premium workout videos from fitness experts.

How does the sleep tracking compare to dedicated sleep monitors?

Sleep tracking uses accelerometer and heart rate data to determine sleep stages with good accuracy for consumer devices. It identifies light, deep and REM sleep phases whilst tracking sleep duration and efficiency. The Sleep Profile feature analyses 30 days of data to create personalised sleep insights, though it may not match the precision of clinical sleep studies.

Can this watch track swimming and water activities?

The watch is water-resistant up to 50 metres, making it suitable for swimming and water sports. It automatically detects swimming activities and tracks lap counts, duration and calories burned. However, heart rate monitoring may be less accurate underwater and GPS won't function during pool swimming sessions.

How does the Daily Readiness Score actually work?

The Readiness Score analyses three key metrics: heart rate variability during sleep, recent sleep quality scores and activity levels from previous days. The algorithm calculates a score from 1-100, with higher scores indicating better recovery status. Scores above 65 suggest readiness for intense workouts, whilst lower scores recommend lighter activities or rest days.