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Garmin Forerunner 255S Music

Works with
iPhone and Android
Display
MIP, 1.1 in
Case sizes
41 mm
Battery
12 days
GPS battery
26 hours
Water resistance
5 ATM
Weight
39 g
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Garmin Forerunner 255S Music at a glance

Garmin Forerunner 255S Music full specifications

Overview

Brand Garmin
Model Forerunner 255S Music
Series Forerunner

Platform & apps

Works with iPhone and Android phones, running Garmin.

It has an app store for extra apps and watch faces.

Operating system Garmin
Works with iPhone and Android
Storage 4 GB
App store Yes

Display

A memory-in-pixel screen: always on, easy to read in sunlight and very light on the battery.

1.1 in.

Display type MIP
Screen size 1.1 in
Resolution 218 x 218
Colour display Yes

Design & durability

A 41 mm case weighing 39 g.

Rated 5 ATM: fine for swimming laps and showers.

Case sizes 41 mm
Case shape Round
Dimensions 41 x 41 x 12.4 mm
Thickness 12.4 mm
Weight (case) 39 g
Bezel material fiber-reinforced polymer
Lens Corning Gorilla Glass 3
Band material silicone
Band width 18 mm
Band fitting 18 mm quick release
Fits wrists 110-175 mm
Water resistance 5 ATM

Battery

Around two weeks: up to 12 days in smartwatch mode.

With GPS on, up to 26 hours, or 13 hours in multi-band mode. Real battery life depends on screen brightness, notifications and workouts.

Battery (smartwatch mode) 12 days
Battery (GPS) 26 hours
Battery (multi-band GPS) 13 hours
All battery modes Smartwatch: 12 days; GPS: 26 hours; All satellite systems: 20 hours; Multi-band GPS: 13 hours; GPS: 5.5 hours
Battery type Lithium ion
Charging proprietary-plug

GPS & navigation

Built-in multi-band GPS for accurate tracks, even near tall buildings and trees.

Navigation shows a breadcrumb trail, not a full map.

GPS Built-in
Multi-band GPS Yes
Satellite systems GPS, GLONASS, Galileo, QZSS, BeiDou
Automatic GNSS mode Yes
Maps Breadcrumb trail
Navigation features back-to-start, waypoints, course import

Health & sensors

Tracks heart rate around the clock, plus blood oxygen and HRV.

For sleep, it offers sleep coaching.

Sensors optical HR, SpO2, barometer, compass, gyroscope, accelerometer, thermometer
Heart-rate sensor Elevate
Heart-rate tracking 24/7
High/low heart-rate alerts Yes
Heart-rate variability Yes
Blood oxygen (SpO2) Yes
Respiration rate Yes
Sleep tracking Sleep coaching
Stress tracking Yes
Energy score Body Battery
Cycle tracking Yes

Safety

Has an emergency SOS feature.

SOS works through your paired phone. Live tracking lets friends follow your workouts.

Emergency SOS Via phone
Incident detection Yes
Live tracking Yes

Training

Built for training, with the metrics serious athletes use.

It adds a triathlon mode, running power and daily suggested workouts.

Auto activity detection Yes
Triathlon / multisport Yes
Swim tracking Pool and open water
Underwater heart rate Yes
Training metrics VO2 max, training load, training effect, recovery time, race predictor, lactate threshold, HRV status
Adaptive coaching Yes
Running dynamics Yes
Wrist running power Yes
Strength rep counting Yes
Heart-rate broadcast Yes
External sensors ANT+, Bluetooth HR strap, power meter, foot pod, speed/cadence, bike radar/lights
Smart trainer control Yes

Smart features

Smart extras include contactless payments and music storage.

Notifications Yes
Message replies Android
Contactless payments Yes
Payment service Garmin Pay
Music storage Yes
Wi-Fi Wi-Fi
Find my phone Yes

Specs compiled from Garmin's product pages and datasheets. Manufacturers revise hardware between versions, so check the version on the box. Spotted an error? Tell us.

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