Samsung
Samsung SM-R861NZKAXAA Galaxy Watch FE 40mm Black
★★★★★
Your health dashboard, personal trainer, and sleep coach — all packed into a sleek 40mm smartwatch.
$189.55*$199.99Save 5%
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*Price sourced from Amazon.com. Last updated:Jun 27, 2026.Price and availability are subject to change.
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Overview
Key Features
FITNESS TRACKING: Get performance insights on step counts, active minutes, calories burned and more; Your Watch automatically tracks everyday movements like walking and running — plus, it helps you manually track over 90 other exercises¹
KEEP YOUR BODY IN BALANCE: Get to know your body better with the BIA sensor² ¹; Use your Watch to get data on body fat, muscle mass, water levels and more, and use these insights to work on goals like muscle growth and improved hydration
HIT YOUR PERSONAL BEST: Work out at your preferred intensity using personalized heart rate zones³ with Galaxy AI; It tailors the data to you the more you use it so you both get better together
SMART HEART MONITORING : Galaxy Watch FE helps you keep an eye on your heart with ECG Monitoring & periodic heart rate measurements to detect irregularities⁴; Get a step ahead of your health by sharing these personalized readings with your doctor
A SLEEP COACH ON YOUR WRIST: Advanced Sleep Coaching with Galaxy AI⁵ helps you plan bedtime, detect snoring⁶ and understand & track your sleep stages (awake, light, deep, REM); Your sleep data & insights adapt to you the more you use it
Specifications
Brand
Samsung
Model
SM-R861NZKAXAA
Case Size
40mm
Color
Black
Connectivity
Bluetooth
Sensors
BIA (Body Composition), ECG, Heart Rate Monitor
Fitness Tracking
90+ exercises, auto-detection for walking/running
Health Features
ECG Monitoring, Irregular Heart Rate Detection, Sleep Coaching, Body Composition Analysis
AI Features
Galaxy AI (Personalized HR Zones, Advanced Sleep Coaching)
Compatibility
Requires compatible Samsung Galaxy smartphone, Samsung Health app, Samsung Account
Pros & Cons
👍 Pros
- BIA body composition sensor provides body fat, muscle mass, and hydration data directly from your wrist — a feature usually reserved for pricier models.
- ECG monitoring and irregular heart rate detection give you shareable health data for doctor visits.
- Galaxy AI-driven sleep coaching adapts to your patterns over time, offering genuinely personalized bedtime and recovery insights.
- Compact 40mm case is comfortable for all-day wear and overnight sleep tracking without feeling bulky.
- Over 90 trackable exercise types with automatic detection for walking and running cover most fitness routines without manual input.
👎 Cons
- Full feature set requires a Samsung Galaxy phone — iPhone and non-Samsung Android users lose access to ECG, Galaxy AI, and advanced health features.
- No LTE option in this model — you need your phone nearby for notifications, calls, and connected features.
- The FE branding signals cost savings, and the display and processor are a step behind Samsung's flagship Watch Ultra or Watch7 series.
- Battery life under heavy GPS and continuous heart rate tracking may require daily charging rather than the multi-day life some competitors offer.
- Samsung Health app ecosystem can feel cluttered, and some features require a Samsung Account setup before first use.
Frequently Asked Questions
Do I need a Samsung phone to use the Galaxy Watch FE?
For the full feature set, yes. Core features like Galaxy AI-powered heart rate zones, advanced sleep coaching, and ECG monitoring require a compatible Samsung Galaxy phone with the Samsung Health app. Basic fitness tracking works more broadly, but you'll miss the standout features without a Samsung phone.
How does the body composition (BIA) sensor work on the Galaxy Watch FE?
You place two fingers on the watch's side buttons, and the BIA sensor sends a low-level electrical signal to measure body fat percentage, muscle mass, water levels, and more. It takes about 15 seconds and gives you trending data over time — useful for tracking fitness progress rather than as a medical-grade measurement.
Can the Galaxy Watch FE track swimming or water-based activities?
The Galaxy Watch FE supports over 90 manually tracked exercises, but you should check Samsung's specifications for its specific water resistance rating before submerging it. It is designed primarily as an everyday fitness and health tracker.
Is the 40mm size comfortable for smaller wrists?
The 40mm case is Samsung's smaller watch option and sits comfortably on wrists roughly 5.5–7.5 inches in circumference. It's noticeably less bulky than 44mm+ models, making it a better fit if you want something that doesn't feel like wearing a gadget to bed during sleep tracking.
What does Galaxy AI actually do on this watch?
Galaxy AI personalizes your heart rate zones based on your fitness data over time, so your workout targets adjust as you improve. It also powers the sleep coaching feature, learning your patterns to give increasingly tailored bedtime recommendations and sleep stage analysis.
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