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Fitbit Inspire 3 Midnight Zen smartwatch with black silicone band and AMOLED display

Fitbit

Fitbit Inspire 3 FB424BKBK-US Midnight Zen smart watch

SKU CH-YD5Q-AXNCP MPN FB424BKBK-US

A health and fitness tracker with AMOLED display, 50-metre water resistance, SpO2 monitoring and up to 10 days of battery life

  • ColorMidnight Zen
  • TypeActivity Tracker
  • Band MaterialSilicone
  • Band LengthBoth small and large sizes included in box. Small: Fits wris
  • Water Resistance50 meters
  • Display TechnologyAMOLED

Color Midnight Zen

  • Up to 10 days battery life between charges
  • AMOLED display shows notifications and metrics clearly
  • Water resistant to 50 metres for swim tracking
  • Both small and large bands included for 5.1 to 8.7 inch wrists
  • Tracks heart rate, SpO2 and sleep automatically

Health & Fitness Tracker for Daily Wellness

The Fitbit Inspire 3 FB424BKBK-US is a lightweight activity tracker designed for continuous wear. It monitors heart rate, blood oxygen and skin temperature around the clock. Both small and large silicone bands are included to fit wrists from 5.1 to 8.7 inches. A Google account and the Fitbit app are required for setup and data review.

Up to 10 Days Battery with AMOLED Display

The lithium-polymer battery delivers up to 10 days of use between charges depending on settings. The AMOLED screen provides clear visibility for notifications and metrics. Water resistance to 50 meters allows swimming and showering without removal. No active cooling or audible alerts are present; vibration handles alarms and reminders silently.

6-Month Premium Access and Automatic Tracking

The box contains the tracker, both band sizes and a proprietary charging cable. A 6-month Fitbit Premium membership unlocks Daily Readiness Scores, personalized Sleep Profiles and guided mindfulness sessions. Automatic exercise recognition covers 20-plus modes while Smart Wake uses vibration to rouse you at the optimal sleep stage. Buyers who want built-in GPS or onboard music storage should consider other devices.

Highlights

  • Up to 10 days battery life between charges
  • AMOLED display shows notifications and metrics clearly
  • Water resistant to 50 metres for swim tracking
  • Both small and large bands included for 5.1 to 8.7 inch wrists
  • Tracks heart rate, SpO2 and sleep automatically

Specifications

BrandFitbit
ModelInspire 3
ColorMidnight Zen
TypeActivity Tracker
Band MaterialSilicone
Band LengthBoth small and large sizes included in box.
Small: Fits wrist 5.1" - 7.5" in circumference
Large: Fits wrist 6.3" - 8.7" in circumference
Water Resistance50 meters
Display TechnologyAMOLED
Built-in StorageSaves 7 days of detailed motion data, minute by minute
Saves daily totals for past 30 days
Stores heart rate data at 1-second intervals during exercise tracking and at 5-second intervals all other times
Battery LifeBattery life of up to 10 days. Battery life and charge cycles vary with use, settings and other factors; actual results will vary. We recommend charging your tracker every few days to ensure you are always tracking.
Battery TypeLithium-polymer
SpecificationRequirements:
Google account will be required. Learn more.
The Fitbit app is compatible with most popular phones. To set up and use your Fitbit products and services, you must install the Fitbit app on a compatible device running one of the following operating systems:
Apple iOS 15 or higher.
Android OS 10 or higher. See additional tips for Android phones here.
Syncing range: Up to 30ft
Certain features like smartphone notifications may require Android 10+. Check your device compatibility.
Syncing requires Bluetooth LE and Internet connection.
FeaturesSensors and components:
3-axis accelerometer
Optical heart rate monitor
Vibration motor
Red and infrared sensors for blood oxygen (SpO2) monitoring. Not available in all countries. Not intended to diagnose or treat any medical condition or for any other medical purpose. Intended to help you manage your well-being and keep track of your information. Requires more frequent charging.
Ambient light sensor
Device temperature sensor (skin temperature variation available in the Fitbit app). Only available in the Fitbit app and only displays variation. Not available in all markets. Not inten
Package ContentFitbit Inspire 3
Classic wristband (both small & large)
Charging cable
Shipping weight0.12 kg
Package size152 × 91 × 33 mm

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Questions about this item

How do I set up the Fitbit Inspire 3 and what step is often missed?

Install the Fitbit app on a compatible phone, create or sign in to your Google account, then pair the tracker via Bluetooth. The step often missed is completing the Google account sign-in before attempting to pair the device.

What maintenance will the Inspire 3 need over time?

The lithium-polymer battery requires charging every few days for continuous tracking; battery life and charge cycles vary with use and settings. Clean the silicone band regularly with water and mild soap to prevent skin irritation from sweat buildup.

What limit appears first during sustained all-day wear?

Battery life of up to 10 days is the primary limit; actual results vary with settings like continuous heart rate, SpO2 monitoring, and notification frequency. The 50-meter water resistance supports swimming but does not extend battery runtime.

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