New prices
€157
– €206
Fitbit FB521GLBM-US Advanced Health and Fitness Smartwatch
This advanced health and fitness smartwatch offers comprehensive wellness monitoring with features like all-day stress detection using cEDA technology, an ECG app for atrial fibrillation assessment, and personalized sleep profiles. It includes built-in GPS for tracking activities, a workout intensity map, and a battery life exceeding six days. The device provides detailed health insights, supports various exercise modes, and offers connectivity options for calls, texts, and notifications. It is water-resistant and customizable with interchangeable clock faces.
- 3 variants
- All-day stress detection with cEDA
- batteries: 2 variants
Used prices
€166
Price spread
~31%
Across new variants
Customer rating
10,074 ratings
Available variants (3)
Choose a variant, then open its detail page for seller-specific information.
7.05 ounces
Retailer
Available to order
- Product Dimensions
- 1.57 x 0.47 x 1.57 inches; 7.05 ounces
- batteries
- 1 LR44 batteries required. (included)
6.74 ounces, mens
Retailer
Available to order
- Product Dimensions
- 1.57 x 0.47 x 1.57 inches; 6.74 ounces
- batteries
- 1 Lithium Ion batteries required. (included)
1.3 ounces
Retailer
Available to order
- Product Dimensions
- 1.57 x 0.47 x 1.57 inches; 1.3 ounces
- batteries
- 1 Lithium Ion batteries required. (included)
Variant comparison
Compare prices, availability, and key variant differences in one table.
| Feature | 7.05 ounces | 6.74 ounces, mens | 1.3 ounces |
|---|---|---|---|
| Price | €165.16 | €157.34 | €206.29 |
| Updated | Jul 17, 2026 | Jul 16, 2026 | Jul 13, 2026 |
| Availability | Available to order | Available to order | Available to order |
| Product Dimensions | 1.57 x 0.47 x 1.57 inches; 7.05 ounces | 1.57 x 0.47 x 1.57 inches; 6.74 ounces | 1.57 x 0.47 x 1.57 inches; 1.3 ounces |
| batteries | 1 LR44 batteries required. (included) | 1 Lithium Ion batteries required. (included) | 1 Lithium Ion batteries required. (included) |
Live offers
Partner offers are temporarily unavailable for this product.
Partner offers are temporarily unavailable for this product.
Overview
Compare Fitbit FB521GLBM-US Advanced Health and Fitness Smartwatch variants, pricing tiers and key differences.
Learn moreHow variants differ
- Product Dimensions
- batteries
Who each variant is for
- Start with your budget: the visible price spread across variants is about 31%.
Reviews
4.1 / 5
from 10,074 ratings
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When this device makes sense
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