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Lunar white aluminium smartwatch with white silicone band, square AMOLED display

Fitbit

Fitbit Sense 2 Smart Watch FB521SRWT-US Lunar White Platinum Aluminium

SKU CH-9A3C-06MT8 MPN FB521SRWT-US

Advanced health smartwatch with cEDA stress detection, ECG app, SpO2 monitoring and built-in GPS, plus six-day battery life and both band sizes included

  • Battery runtimeof 6+ days. Battery life and charge cycles vary with use, se
  • Housing materialAluminium
  • Strap materialSilicone
  • Strap lengthBoth small and large sizes included in box. Small: Fits wris
  • Display typeAMOLED
  • Internal storageSaves 7 days of detailed motion data, minute by minute

Color Lunar White

  • Tracks health stats for 6+ days per charge
  • 12-minute charge adds a full day of use
  • Built-in GPS maps workout intensity without phone
  • cEDA sensor gives daily Stress Management Score
  • ECG app checks for atrial fibrillation signs

Advanced health smartwatch

The Fitbit Sense 2 is a health-focused smartwatch built with an aluminium case and AMOLED display. It is designed for users who want continuous stress, heart-rate and sleep insights alongside everyday smartwatch functions. A Google account and the Fitbit app on a compatible phone are required for setup and ongoing use.

6-plus day battery and on-device storage

The battery delivers six or more days of typical tracking, though always-on display, SpO2 and the cEDA sensor reduce that span. A quick 12-minute charge adds a full day of runtime. Internal memory holds seven days of minute-by-minute motion data before the oldest records are overwritten.

Two band sizes and Fitbit Premium trial

Both small and large classic silicone bands ship in the box, covering wrist circumferences from 5.1 to 8.6 inches. The package also includes a proprietary charging cable. Buyers receive a six-month Fitbit Premium membership that unlocks guided workouts, mindfulness sessions, Daily Readiness Scores and deeper sleep analysis.

How it compares

Measured against everything we stock in Smartwatches & Fitness Watches, at today’s prices. Recalculated every night.

Price $197.99
Pricier than about 78% of the 346 comparable items (median $82.49).

Specifications

Product
Brand nameFitbit
Model nameSense 2
Part numberFB521SRWT-US
Product colorLunar White
Product typeSmart Watch
Storage
Internal storageSaves 7 days of detailed motion data, minute by minute
Display
Display typeAMOLED
Size & build
Housing materialAluminium
Strap materialSilicone
Strap lengthBoth small and large sizes included in box.
Small: Fits wrist 5.1–7 in in circumference
Large: Fits wrist 6.5–8.6 in in circumference
Overall height0.44 in (11.2 mm)
Overall width1.59 in (40.5 mm)
Product depthLength: 1.59 in (40.5 mm)
Product weight0.08 lb (37.64 g)
Shipping weight0.26 kg
Package size40 × 40 × 12 mm
In the box
Included itemsFitbit Sense 2
Classic band (small & large)
Charging cable

Other versions of this model

1 more in the same range

Questions about this item

Will the Fitbit Sense 2 pair with the older Android phone I still use daily?

The Fitbit app works with most popular phones; a Google account is required for setup and ongoing use.

How can I confirm the cEDA sensor is tracking stress correctly after I put the watch on?

Open the Fitbit app to view your daily Stress Management Score and real-time body response graph generated by the electrical sensor.

Does the box include both band sizes and the charger, or must I buy a large band separately?

The package contains the Sense 2 watch, classic silicone bands in both small (5.1–7 in) and large (6.5–8.6 in) sizes, and a charging cable.

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