Garmin Forerunner 255

Comprehensive Running Features: GPS-based distance, pace, and time tracking, running dynamics (vertical oscillation, ground contact time, stride length), cadence, running power, performance condition, lactate threshold, PacePro pacing strategies, run workouts, trail run auto climb, race predictor.

Multi-Sport Tracking: Supports various activities like running, cycling, swimming, hiking, triathlon, gym workouts, and more.

Health and Wellness Monitoring: Wrist-based heart rate, daily resting heart rate, abnormal heart rate alerts, respiration rate, fitness age, Body Battery energy monitor, all-day stress tracking, relaxation reminders, sleep tracking (advanced), sleep coach, nap detection, hydration tracking, women's health tracking, Health Snapshot.

Smart Features: Smart notifications, text response/reject call with text (Android only), morning report, calendar, weather forecasts, Garmin Pay, Connect IQ compatibility (downloadable watch faces, data fields, widgets, and apps).

Long Battery Life: Up to 14 days in smartwatch mode, up to 30 hours in GPS-Only GNSS mode.

Accurate GPS: Multi-band GNSS support for improved positioning accuracy.

Display: 1.3" (33 mm) diameter, 260 x 260 pixels, sunlight-visible, transflective memory-in-pixel (MIP)

Lens Material: Corning Gorilla Glass 3

Bezel Material: Fiber-reinforced polymer

Strap Material: Silicone (22 mm quick release)

Case Size: 45.6 x 45.6 x 12.9 mm

Weight: 49 g

Water Rating: 5 ATM

Memory/History: 4 GB

Connectivity: Bluetooth, ANT+

GPS: GPS, GLONASS, GALILEO, SATIQ

Battery Life:

• Smartwatch mode: Up to 14 days
• GPS-Only GNSS mode: Up to 30 hours
• All-Systems GNSS mode: Up to 25 hours
• All-Systems GNSS mode plus Multi-Band: Up to 16 hours