Features

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Camera and Display Features
Display Resolution 240 x 180 Pixels  312 x 390 Pixels  454 x 454 Pixels
Display Size 1.25 inch  1.25 inch  1.65 inch  1.77 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 CalorView 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  2  3
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  1 Year Warranty  2 Years 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, Magnetic Charging Cable (1 m), Band, Quick StView More... Smartwatch, Charger, User Manual
Model Number FB503GYBK  FB501BUS  MTF32HN/A  FTW4011
Model Name Ionic  Surge  Watch Series 3 GPS -  4th Gen Explorist HR
Dial Shape Square  Square  Rectangle  Circle
Strap Color Black  Blue  Black  Silver
Strap Material Elastomer  Elastomer  Silicone  Stainless steel
Size Regular  Small  Regular  Regular
Touchscreen Yes Yes Yes Yes
Water Resistant Yes Yes Yes Yes
Usage Notifier, Fitness & Outdoor  Fitness & Outdoor  Notifier, Fitness & Outdoor  Fitness & Outdoor
Ideal For Unisex  Unisex  Unisex  Men
Dial Color Space Grey 
Water Resistance Depth 50 m  50000 mm  50 m  30 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  Barometric Altimeter, Heart Rate Sensor, Accelerometer, GView More... Accelerometer, Ambient Light, Gyroscope, Heart Rate
Compatible Device iPhone, Android Smartphones  iPhone 5, 5c, 5s, SE, 6, 6 Plus, 6s, 6s Plus, 7 , 7 Plus,View More... iPhone, Android Smartphones
Notification Yes Calendar Reminder, Call Notification, Text Notification  Messages, Calendar, Mail  Yes
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 18 hours  Upto 24 hrs (Based on Usage)
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  90 min  2 hrs
Stand By Time 168 hr 
Platform and Storage Features
Compatible Operating System Android & iOS  Android 4.3, iOS, Windows 7 and Above  iOS 10 and Above  Android 4.4 and Above (Excluding Go Edition) and iOS 9.3  View More...
Operating System Fitbit OS  Fitbit OS  watchOS 4  Wear OS by Google
RAM 512 MB
Processor Name S3  Qualcomm Snapdragon Wear 2100
Internal Memory 8 GB  4 GB
Number of Cores Dual Core 
Connectivity Features
Call Function No  No  No  No
Bluetooth Yes Yes Yes Yes
Wi-Fi Yes Yes Yes No
GPS Yes Yes Yes Yes
Bluetooth Version v4.0  v4.0  v4.2  v4.1
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