Samsung Galaxy Watch 4 40mm WiFi - Black (Renewed)

Items Description

The Samsung Galaxy Watch 4 40mm WiFi - Black (Renewed) is a compact smartwatch designed for Android users who want integrated health monitoring, fitness tracking, and daily connectivity in a lightweight package. This 40mm Bluetooth and WiFi model pairs a streamlined aluminum case with a vibrant Super AMOLED display, offering a balanced option for wrists that prefer a smaller profile without sacrificing core smartwatch capability. The Black finish delivers a neutral, understated look that transitions easily from workouts to professional settings.

 

The Galaxy Watch 4 series marks a significant step in Samsung's wearable lineup, introducing a unified platform with Wear OS powered by Samsung. This 40mm variant includes a full suite of sensors, including a bioelectrical impedance analyzer for body composition measurements, an optical heart rate sensor, and an ECG monitor. With 5ATM and IP68 durability ratings, the watch handles swimming, rain, and daily wear with confidence. The Super AMOLED display remains sharp and legible outdoors, while the slim 40mm case keeps the watch light enough for all-day and all-night wear.

 

Key Advantages of the Samsung Galaxy Watch 4 40mm WiFi - Black (Renewed)

 

1. Comprehensive Health and Body Composition Tracking

The Galaxy Watch 4 40mm integrates a bioelectrical impedance analysis (BIA) sensor, a feature previously reserved for dedicated body composition scales. This allows users to measure body fat percentage, skeletal muscle mass, basal metabolic rate, and more directly from the wrist. The watch also monitors heart rate continuously, detects irregular rhythms through ECG, and tracks blood oxygen levels during the day and night.

 

• Body Composition: BIA sensor measures body fat, muscle mass, and metabolic rate.
• ECG Monitoring: On-demand electrocardiogram readings to detect atrial fibrillation.
• Blood Oxygen: SpO2 tracking for wellness and high-altitude awareness.
• Heart Rate Alerts: Notifications for unusually high or low resting heart rates.

 

2. Advanced Sleep Analysis with Sleep Score

Sleep tracking on the Galaxy Watch 4 goes beyond basic duration logging. The watch uses its accelerometer and heart rate sensor to detect sleep stages, including REM, light, and deep sleep. Each morning, users receive a sleep score with insights and guidance for improvement. The 40mm case's lightweight design makes it comfortable to wear overnight, which is essential for consistent sleep data collection.

 

• Sleep Stages: Automatic detection of REM, light, and deep sleep cycles.
• Sleep Score: A daily summary that rates sleep quality and offers coaching tips.
• Snore Detection: Uses the smartphone microphone to track snoring patterns when paired.
• Blood Oxygen During Sleep: Monitors overnight SpO2 levels to identify potential breathing disruptions.

 

3. Seamless Fitness Tracking with Auto-Detection

With built-in GPS, the Galaxy Watch 4 40mm tracks outdoor runs, walks, and cycling routes without needing a phone nearby. The watch supports over 90 workout modes, and its auto-detection feature recognizes common activities like running, rowing, and swimming, then prompts the user to start tracking. The compact 40mm form factor sits securely on the wrist during high-intensity movement, and the 5ATM rating allows for swim tracking in pools or open water.

 

• Built-in GPS: Accurate pace, distance, and route mapping for outdoor activities.
• Auto-Workout Detection: Recognizes running, walking, cycling, and more without manual input.
• 90+ Workout Modes: Includes HIIT, pilates, yoga, and strength training presets.
• Swim Tracking: Water-resistant up to 50 meters with lap counting and SWOLF scores.

 

4. Unified Platform with Wear OS Powered by Samsung

This smartwatch runs on Wear OS with Samsung's One UI Watch layer, creating a seamless connection with Android smartphones. Notifications, app permissions, and even watch faces sync automatically between the phone and watch. Users can download third-party apps directly from the Google Play Store on the watch, expanding functionality beyond Samsung's native tools. The 40mm Black variant pairs reliably over WiFi and Bluetooth, keeping users connected throughout the day.

 

• Google Play Store: Install third-party watch apps, including Spotify, Strava, and WhatsApp.
• Smart Notifications: Receive and reply to calls, texts, and emails from the wrist.
• Auto Sync: Watch faces, settings, and app layouts mirror between phone and watch.
• WiFi Connectivity: Stay connected even when the phone is out of Bluetooth range.

 

5. Compact 40mm Design with Super AMOLED Clarity

The 40mm case size of this Galaxy Watch 4 offers a comfortable fit for smaller wrists while still delivering a crisp, vibrant display. The Super AMOLED screen produces deep blacks and vivid colors, ensuring high readability both indoors and under direct sunlight. The Black colorway adds a versatile, low-profile aesthetic that complements casual, athletic, and formal attire alike. Gorilla Glass with a protective layer helps resist scratches from daily wear, and the lightweight aluminum case reduces strain during extended use.

 

• Super AMOLED Display: Sharp text, vivid colors, and outdoor visibility.
• Lightweight Aluminum Case: Comfortable for all-day wear and overnight sleep tracking.
• 5ATM / IP68 Rating: Suitable for swimming, rain, and dusty environments.
• Versatile Black Finish: A neutral look that pairs with any outfit or band style.

 

The Samsung Galaxy Watch 4 40mm WiFi - Black (Renewed) is best suited for Android users who want a compact, feature-rich smartwatch that prioritizes health insights, sleep quality, and daily fitness tracking. Its 40mm case and lightweight aluminum build make it particularly well-suited for those with smaller wrists or anyone who prefers a less bulky wearable. For users seeking continuous health monitoring, reliable workout tracking, and smart notifications without the heft of larger models, this Galaxy Watch 4 delivers a balanced combination of function and everyday comfort.

Specifications of Samsung Galaxy Watch 4 40mm WiFi - Black (Renewed)

Brand	SAMSUNG
Operating System	Android
Memory Storage Capacity	1.5 GB
Special Feature	Pedometer
Battery Capacity	247 Milliamp Hours
Connectivity Technology	gps
Wireless Communication Standard	Bluetooth
Battery Cell Composition	Lithium Ion
GPS	True
Shape	Round
Screen Size	40 Millimeters

Prev:  Samsung Galaxy Watch Active2 (40mm), Gold (Stainless Steel - LTE Unlocked) - SM-R835USDAXAR (Renewed)     Next: SAMSUNG GEAR S3 FRONTIER Smartwatch 46MM - Dark Gray (Renewed)

Specifications
[Brand]	SAMSUNG
[Operating System]	Android
[Memory Storage Capacity]	1.5 GB
[Special Feature]	Pedometer
[Battery Capacity]	247 Milliamp Hours
[Connectivity Technology]	gps
[Wireless Communication Standard ]	Bluetooth
[Battery Cell Composition]	Lithium Ion
[GPS]	True
[Shape]	Round
[Screen Size]	40 Millimeters

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