Price: ₹24,999 - ₹1,499.00
(as of Nov 25, 2025 10:10:32 UTC – Details)
Batteries : 1 Lithium Polymer batteries required. (included)
Product Dimensions : 24.87 x 4.04 x 1.12 cm; 37.65 g
Date First Available : 13 September 2022
Manufacturer : Fitbit(フィットビット)
ASIN : B0B75V25XX
Item model number : FB521SRWT-FRCJK
Manufacturer : Fitbit(フィットビット)
Item Weight : 37.6 g
Item Dimensions LxWxH : 24.9 x 4 x 1.1 Centimeters
Net Quantity : 1.00 count
Included Components : Charging Cable, Classic Belt (Small and Large)
Generic Name : smart watch
Best Sellers Rank: #54,321 in Electronics (See Top 100 in Electronics) #1,088 in Smart Watches
Customer Reviews: 3.8 3.8 out of 5 stars 640 ratings var dpAcrHasRegisteredArcLinkClickAction; P.when(‘A’, ‘ready’).execute(function(A) { if (dpAcrHasRegisteredArcLinkClickAction !== true) { dpAcrHasRegisteredArcLinkClickAction = true; A.declarative( ‘acrLink-click-metrics’, ‘click’, { “allowLinkDefault”: true }, function (event) { if (window.ue) { ue.count(“acrLinkClickCount”, (ue.count(“acrLinkClickCount”) || 0) + 1); } } ); } }); P.when(‘A’, ‘cf’).execute(function(A) { A.declarative(‘acrStarsLink-click-metrics’, ‘click’, { “allowLinkDefault” : true }, function(event){ if(window.ue) { ue.count(“acrStarsLinkWithPopoverClickCount”, (ue.count(“acrStarsLinkWithPopoverClickCount”) || 0) + 1); } }); });
All-day body-response tracking with a newly added sensor;Sleep Profile and breakdown of time in light, deep & REM sleep to see what’s impacting your rest (Premium only)
ECG app;Blood oxygen (SpO2); Notifications for call, text and apps (Available when phone is nearby);6+ day battery life (Varies with use and other factors)
Includes 6-month Premium membership (New Premium members only. Premium included membership must be activated within 60 days of device activation. Valid payment method required. Cancel before membership ends to avoid subscription fees. T&C apply.)
Package Contents: Pack of 1 Device with 2 x Straps (Small & Large) and Charger
Case Material Type: Resin; Band Material Type: Silicone; Human Interface Input: Touch Screenbuttons; Clasp Type: Push Button Deployant Clasp; Item Type Name: Smart Watch; Connectivity Technology: Wifi
Customers say
Customers find the smartwatch’s build quality positive and appreciate its feature richness. Moreover, they like its fitness tracking capabilities, with one customer mentioning it can track all health metrics. However, the functionality receives negative feedback, with multiple customers reporting it stops working after a month. Additionally, customers consider it not worth the investment.