Features

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Camera and Display Features
Display Resolution 240 x 180 Pixels  454 x 454 Pixels  312 x 390 Pixels
Display Size 1.25 inch  1.25 inch  1.77 inch  1.65 inch
Display Type LCD  LCD  OLED Retina Display
Backlight Display Yes Yes Yes
Scratch Resistant Yes Yes Yes
Other Display Features Ion-X (Strengthened Glass), Support Force Touch
Fitness and Watch Functions
Calorie Count Yes Yes Yes Yes
Step Count Yes Yes Yes Yes
Heart Rate Monitor Yes Yes Yes Yes
Other Fitness Features Sleep Monitoring  Built in Fitness Tracker: Steps Count, Distance and Calor View More...
Date & Time Display Yes Date & Time  Yes Yes
Compass Yes
Calendar Yes Yes Yes Yes
Alarm Clock Yes Yes Yes Yes
Language English 
Number of Buttons 3  3  2
Other Watch Functions Personalize Dial, Control Music, Calendar Alerts, Social View More...
Altimeter Yes Yes
Dimensions
Weight 303.3 g 
Other Dimensions 20.88 mm x 24.36 mm x 34 mm 
Width 34 mm 
Warranty
Warranty Summary 1 Year Warranty  2 Years Warranty  1 Year Warranty
Warranty Service Type Carry In  Carry In  Carry In
Covered in Warranty Manufacturing Defects  1 Year Manufacturer Warranty from the Date of Purchase  Manufacturing Defects  Manufacturing Defects
Not Covered in Warranty Physical Damage  Physical Damage  Physical Damage
Domestic Warranty 1 Year  1 Year  2 Year 
Audio and Video Features
Microphone Yes
Voice Control Yes
General
Sales Package Smartwatch, Charger, User Manual  Smartwatch, User Manual, Charger, Dongle  Smartwatch, Charger, User Manual  Smartwatch, Magnetic Charging Cable (1 m), Band, Quick St View More...
Model Number FB503GYBK  FB501BUS  FTW4011  MTF32HN/A
Model Name Ionic  Surge  4th Gen Explorist HR  Watch Series 3 GPS -
Dial Shape Square  Square  Circle  Rectangle
Strap Color Black  Blue  Silver  Black
Strap Material Elastomer  Elastomer  Stainless steel  Silicone
Size Regular  Small  Regular  Regular
Touchscreen Yes Yes Yes Yes
Water Resistant Yes Yes Yes Yes
Usage Notifier, Fitness & Outdoor  Fitness & Outdoor  Fitness & Outdoor  Notifier, Fitness & Outdoor
Ideal For Unisex  Unisex  Men  Unisex
Dial Color Space Grey
Water Resistance Depth 50 m  50000 mm  30 m  50 m
Dial Material Surgical-grade Stainless Steel  Aluminium Case
Product Details
Closure Metal Clasp  Metal Clasp 
Sensor 3-axis Accelerometer, 3-axis Gyroscope, Optical Heart RatView More... GPS,3-axis accelerometers,3-axis gyroscope  Accelerometer, Ambient Light, Gyroscope, Heart Rate  Barometric Altimeter, Heart Rate Sensor, Accelerometer, G View More...
Compatible Device iPhone, Android Smartphones  iPhone, Android Smartphones  iPhone 5, 5c, 5s, SE, 6, 6 Plus, 6s, 6s Plus, 7 , 7 Plus, View More...
Notification Yes Calendar Reminder, Call Notification, Text Notification  Yes Messages, Calendar, Mail
Notification Type Text and Calender Alerts  Vibration 
Battery Type Lithium Polymer  Lithium Polymer  Lithium Ion
Battery Life Upto 6 Days (Based on Usage)  Upto 7 Days, With GPS Upto 10 hrs  Upto 24 hrs (Based on Usage)  Upto 18 hours
Rechargeable Battery Yes Yes Yes Yes
Charger Type USB Cable 
Other Features Wireless Syncing  Maximize Training, Maintain Intensity and Monitor CalorieView More... Interchangeable Watch Band 
Maximum Operating Altitude 9144 m 
Charge Time 120 min  120 min  2 hrs  90 min
Stand By Time 168 hr 
Platform and Storage Features
Compatible Operating System Android & iOS  Android 4.3, iOS, Windows 7 and Above  Android 4.4 and Above (Excluding Go Edition) and iOS 9.3 View More... iOS 10 and Above
Operating System Fitbit OS  Fitbit OS  Wear OS by Google  watchOS 4
RAM 512 MB 
Processor Name Qualcomm Snapdragon Wear 2100  S3
Internal Memory 4 GB  8 GB
Number of Cores Dual Core
Connectivity Features
Call Function No  No  No  No
Bluetooth Yes Yes Yes Yes
Wi-Fi Yes Yes No  Yes
GPS Yes Yes Yes Yes
Bluetooth Version v4.0  v4.0  v4.1  v4.2
Other Connectivity Features Wi-Fi (802.11b/g/n)  Wi-Fi (802.11b/g/n 2.4 GHz)
Messaging Support No 
Call Features Incoming Call Alerts 
Operating Range 6 m 
Third Party App Support Yes