Third-generation Corning Gorilla Glass for enhanced durability and vivid display
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5. Sensors
4th Generation Heart Rate Sensor for improved accuracy
Barometric Altimeter
Pulse Ox (Blood Oxygen Saturation) Sensor
6. GPS & Positioning
Multi-frequency, multi-constellation satellite positioning system for high accuracy
Supports outdoor GPS tracking with real-time route recording
7. Battery Life
Item
Detail
Smartwatch mode
up to 14 days (Forerunner 255), 12 days (255S)
GPS mode
up to 30 hours (Forerunner 255), 26 hours (255S)
Multi-band GPS mode
up to 16 hours (255), 13 hours (255S)
8. Sports & Activity Tracking
Supports 30+ indoor and outdoor sports modes including running, cycling, swimming (pool and open water), triathlon, trail running, strength training, yoga, HIIT, rowing, paddle sports, and more
Triathlon mode with one-button sport switching and continuous data recording
Running power measurement (with compatible sensors)
VO2 max estimation and training effect analysis
HRV (Heart Rate Variability) status monitoring for stress and recovery insights
Interval training and race assistant features
Lap, rest, and sport mode switching via physical buttons
9. Controls
Five mechanical buttons for reliable operation even with gloves or in water sports
LIGHT: short press to toggle backlight, long press to open control menu
START/STOP: confirm, start, pause activities
UP: scroll up, long press to enter settings
DOWN: scroll down, long press to access music controls
BACK: return to previous screen
10. Health Monitoring
Comprehensive physiological tracking including sleep quality, HRV, stress, and recovery
Sleep monitoring with sleep score and detailed analysis
Pulse Ox sensor for blood oxygen levels
11. Smart Features
NFC for contactless payments supporting WeChat Pay and Alipay (offline payment supported in 300+ cities)
Offline music storage and playback (approx. 2000 songs on Forerunner 255)
Morning report feature providing daily health and training readiness insights
Compatibility with Garmin accessories: HRM-Pro, running dynamics sensors, power meters, smart bike trainers, smart scales, VARIA radar and lights
12. Materials & Design
Fiber-reinforced polymer case for lightweight durability
Multiple color options: Night Black, Mystic Gray, Deep Sea Blue, Pure White, Morning Mist Gray, Bubblegum Pink
Third-generation Corning Gorilla Glass for scratch resistance
13. Additional Features
Multi-sport and triathlon support with seamless sport switching
Race and event assistant with integrated event information
Heat and altitude acclimation tracking
Training readiness and load focus metrics
Offline maps not included; no touchscreen interface to avoid accidental inputs during activity
14. Charging & Connectivity
USB charging cable included
Bluetooth connectivity for smartphone syncing and notifications
15. Usage Notes
GPS signal acquisition required before outdoor activities for accurate tracking
Mechanical buttons ensure usability in gloves and wet conditions
Battery life varies based on usage and settings; laboratory data provided for reference only
This specification summary covers the GARMIN Forerunner 255 series, designed for professional runners and multi-sport athletes seeking accurate tracking, comprehensive health monitoring, and smart features in a durable, lightweight wristwatch.
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