Garmin D2 Mach 2 vs Garmin Forerunner 255 comparison

Show Only Differences Highlight Differences	Garmin D2 Mach 2	Garmin Forerunner 255
key specs
Display Size	35mm	33mm
Dial Shape	Round	Round
Ideal For	Unisex	Unisex
Strap Colour	-	Blue
Compatible OS	-	Android, iOS
Strap Material	-	Silicone
general
Brand	Garmin	Garmin
Model	D2 Mach 2	Forerunner 255
Release date	October 22, 2025	June 30, 2022
Model Name	Garmin D2 Mach 2	Forerunner 255
Dial Colour	Black	Black
Dial Shape	Round	Round
Water Resistant	10 ATM	5 ATM
Ideal For	Unisex	Unisex
Model Number	-	010-02641-53
Strap Colour	-	Blue
Strap Material	-	Silicone
Touchscreen	-	1,3-inch
dimensions
Width	47	45.6
Height	47	45.6
Thickness	13.8	12.9
Weight (g)	73.00	49.00
product details
Talk time	14	-
Sensor	-	GPS, GLONASS, Galileo, Multi-frequency positioning, Garmin Elevate wrist heart rate monitor, Barometric altimeter, Compass, Gyroscope, Accelerometer, Thermometer, SpO2
Notification Type	-	Smart Notifications
Battery Life	-	14 Days
Rechargeable Battery	-	Yes
connectivity features
Call Function	Yes	-
Bluetooth	Yes	Yes
Wi-Fi	Yes	-
GPS	Yes	Yes
Third Party App Support	Yes	-
Call Features	Yes	-
Other Connectivity Features	Glonass, Galileo, Beidou, QZSS	-
camera and display features
Display Resolution	454 x 454	260x260
Display Size	35mm	33mm
fitness and watch functions
Step Count	Yes	Yes
Calorie Count	Yes	Yes
Heart Rate Monitor	Yes	Yes
Compass	Yes	Yes
Calendar	Yes	-
Alarm Clock	Yes	-
Date & Time Display	Yes	Yes
Language	English	-
Altimeter	-	Yes
Other Fitness Features	-	Wrist-based Heart Rate, Daily Resting Heart Rate, Abnormal Heart Rate Alerts, Respiration rate, Pulse Ox Blood Oxygen Saturation, Fitness Age, Body Battery Energy Monitor, All-day Stress, Relaxation reminders, Relaxation breathing timer, Women's Health, Health snapshot
platform and storage features
Compatible Operating System	-	Android, iOS
Internal Memory	-	4GB

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