Fitbit Sense 2 Advanced Health Smartwatch (Blue Mist/Pale Gold)

How accurate is the ECG feature and who can use it?

The ECG app uses medical-grade sensors to detect irregular heart rhythms that may indicate atrial fibrillation. However, it's only available in select countries and not suitable for people under 22 years old or those with known arrhythmias. The readings take 30 seconds and can be shared with healthcare professionals, but they're not intended for medical diagnosis or treatment of heart conditions.

What is the cEDA stress monitoring and how does it work?

Continuous electrodermal activity (cEDA) monitoring uses sensors that detect tiny changes in your skin's electrical conductivity, which correlates with stress responses. This provides real-time stress detection throughout the day, generating a daily Stress Management Score. The feature helps identify stress patterns and triggers, offering guided breathing exercises and mindfulness content to help manage stress levels more effectively.

How long does the battery actually last with different usage patterns?

Battery life varies significantly based on usage. With typical use including notifications, heart rate monitoring and occasional GPS workouts, expect 6+ days. However, continuous GPS tracking reduces this to approximately 12 hours. Features like SpO2 monitoring, frequent notifications and always-on display will decrease battery life. The fast charging feature provides 24 hours of use with just 12 minutes of charging.

Is the sleep tracking accurate and what insights does it provide?

The sleep tracking uses heart rate variability, movement sensors and breathing patterns to analyse sleep stages including light, deep and REM sleep. The personalised Sleep Profile develops over time, comparing your patterns to similar demographics. You receive a daily Sleep Score, sleep stage breakdown and personalised recommendations. The smart wake alarm uses this data to wake you during lighter sleep phases for better morning alertness.

Can I swim and shower with the Sense 2?

Yes, the device is water resistant to 50 metres, making it suitable for swimming, showering and water sports. It can track swimming workouts and withstand pool chemicals and salt water. However, avoid hot water like saunas or hot tubs as extreme temperatures can damage the device. After water exposure, dry the device and band thoroughly to prevent skin irritation.

What smartphone compatibility is required?

The Sense 2 requires iOS 15 or higher for iPhones, or Android OS 9.0 or higher for Android devices. You'll need the Fitbit app and a Google account for full functionality. Some features like Google Maps are initially Android-only but coming to iOS. Bluetooth connectivity is essential for syncing data, receiving notifications and making on-wrist calls when your phone is nearby.

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

The Premium membership provides advanced analytics, personalised insights, guided programmes and detailed health metrics dashboards. You get access to mindfulness content, advanced sleep insights, workout programmes and nutrition guidance. However, this is only for new and returning Premium users, requires activation within 60 days of device setup and needs a valid payment method as it auto-renews after the trial period.

How does the Daily Readiness Score work?

The Daily Readiness Score analyses your recent activity levels, heart rate variability and sleep quality to determine how ready your body is for exercise. Scores range from poor to excellent, with personalised recommendations for workout intensity or recovery focus. This helps prevent overtraining and optimises workout timing based on your body's current state, though this feature requires a Premium membership for full access.