Average Battery LifeSmartwatch mode: Up to 12 days. GPS-only GNSS mode: Up to 26 hrs. All-Systems GNSS mode: Up to 20 hrs. All-Systems GNSS mode plus Multiband: Up to 13 hrs.
Battery TypeLithium Ion
Display Size1.1 inches
IlluminationBacklight
AltimeterPressure-based
CompassYes
GPS/Satellite DetectableYes
HRM Included/IntegratedYes
Heart Rate Sensor TypeWrist-based
Average Heart RateYes
Pulse OximeterYes
Heart Rate Target Zone(s)Yes
VO2 Max EstimateYes
Recovery AdvisingYes
Tracks StepsYes
Pedometer TypeDigital 3-axis Accelerometer
Pace AlertYes
Interval TrainingYes
Tracks Calories BurnedYes
Water-Resistant Depth50 meters
Pool Lap RecognitionYes
Stroke RecognitionYes
Sleep TrackingYes
AlarmYes
Time DisplayYes
StopwatchYes
Programmable RoutesYes
Number of Routes30
Number of Waypoints1000
CustomizationApps
Smart Device NotificationsYes
Data ExchangeANT+
Compatible Fitness AccessoriesHeart Rate Monitor
GenderUnisex
Description
Run at a higher level. The smaller-size Garmin Forerunner 255S watch helps you with training status, race-day planning, GPS, and workouts that adapt to your performance and goals.
Features
Race widget helps you plan your race-day strategy, while morning report reveals your overall health alongside the day ahead
Built with a smaller-size, slim design and an always-on, full-color display that's light on the wrist and easy to read even in direct sunlight
Up to 12 days of battery life in smartwatch mode and up to 26 hrs. in GPS mode
Customize with free watch faces, apps and more from Garmin Connect IQ Store
With Garmin Pay™ contactless payments via a supported card, it's easy to buy that post-workout coffee
Receive emails, texts and alerts right on your watch when paired with your Apple® or Android™ smartphone; respond to texts with an Android phone
See your health and fitness information, connect and compete with friends, sign up for challenges, earn badges, and more in the Garmin Connect™ smartphone app
Get ready for your next race with training tips, personalized daily suggested workouts, and completion time predictions based on course details, weather and performance
View your entire week of daily suggested workouts, which adapt after every run to match your performance and recovery
HRV status tracks your heart rate variability even while you sleep, giving you greater insight into your overall wellness, recovery and training performance
Morning report summarizes your sleep, recovery time, training status, HRV status and daily workout suggestion in one place as soon as you wake up
The watch evaluates your current training status to indicate if you're under-training or overdoing it and updates recovery times
Switch up your workout routine with more than 30 activity profiles for running, triathlon, cycling, open-water swimming and more
Get free adaptive training plans from Garmin Coach for a 5K, 10K and half-marathon, or create your own custom workouts in the Garmin Connect app
Connect a Running Dynamics Pod or HRM-Pro™ monitor (not included) to get a continuous measurement of your running power on your wrist to help manage your effort
Multiband satellite tracking on GPS, GLONASS and Galileo networks gives you superior accuracy for how far and fast you move—even in challenging environments
Safety and tracking features make it easy to share your location with chosen contacts if you feel unsafe, if an incident is detected, or for loved ones to track your runs
Safety tracking features require setup and your smartphone to be in an area with network coverage where data connectivity is available
This device is intended to give an estimate of your activity and metrics