Garmin Forerunner 255/255S Specifications
Design & Build
| Case size(s) | 46 mm (Forerunner 255) |
|---|---|
| Variants (India) | Forerunner 255 Forerunner 255 Music Forerunner 255S Forerunner 255S Music |
| Dimensions (H × W × T) | Forerunner 255 / 255 Music: 45.6 × 45.6 × 12.9 mm |
| Weight | Forerunner 255 / 255 Music: 49 g |
| Bezel material | Fibre-reinforced polymer |
| Display glass / lens | Corning Gorilla Glass 3 |
| Strap material | Silicone |
| Strap width / size | 22 mm quick-release bands (industry standard); fits 130–205 mm wrists |
| Water & dust resistance | 5 ATM |
| Colour options | Forerunner 255: Slate Grey, Tidal Blue Forerunner 255 Music: Whitestone, Black Forerunner 255S: Powder Grey, Light Pink Forerunner 255S Music: Whitestone, Black |
| Buttons / crown | Buttons |
| Touch and/or button lock | Yes |
Display
| Display type | Sunlight-visible, transflective memory-in-pixel (MIP) |
|---|---|
| Screen size | Forerunner 255 / 255 Music: 1.3 inches (33 mm) |
| Resolution | Forerunner 255 / 255 Music: 260 × 260 pixels |
| Touchscreen | No |
| Watch faces | Downloadable watch faces from the Connect IQ store |
| Colour display | Yes |
Performance & Software
| Storage | 4 GB |
|---|---|
| Companion app | Garmin Connect |
| Phone compatibility | iPhone, Android |
| Connect IQ | downloadable watch faces, data fields, widgets and apps; on-device Connect IQ store |
| Settings sync | real-time with Garmin Connect mobile |
| Garmin Messenger app | compatible |
| Security updates | until at least 01/06/2024 |
| Clock | alarm, timer, stopwatch, sunrise/sunset times, GPS time sync, automatic daylight saving time |
Connectivity
| Bluetooth | Bluetooth Smart |
|---|---|
| GPS / GNSS | Built-in GPS (GPS, GLONASS, Galileo), multi-band with SatIQ technology |
| ANT+ | Yes |
| HR broadcast over ANT+ | Yes |
| Smart trainer control | Yes |
| VIRB camera remote | Yes |
Health Tracking
| Heart rate | Wrist-based heart rate (constant, every second), daily resting heart rate, abnormal heart rate alerts (high and low) |
|---|---|
| SpO2 (blood oxygen) | Pulse Ox blood oxygen (spot-check, optional all-day acclimation and in sleep) |
| Sleep tracking | Advanced sleep tracking with sleep score and insights, sleep coach; nap detection |
| Stress tracking | All-day stress, relaxation reminders, relaxation breathing timer |
| HRV | HRV status |
| Women's health | Menstrual cycle and pregnancy tracking (in Garmin Connect and optional Connect IQ widget) |
| Other | Body Battery energy monitor |
| Other | Respiration rate (24x7) |
| Other | Fitness age |
| Other | Health Snapshot |
| Other | Hydration tracking (in Garmin Connect and optional Connect IQ widget) |
| Activity tracking | steps, auto goal, calories, floors climbed, distance, intensity minutes, Move IQ |
Sports & Fitness
| Sports modes | 30+ built-in activity profiles, including triathlon |
|---|---|
| Training insights | VO2 max (run and trail run), training status, training load, load ratio, training load focus, acute load, training effect (aerobic and anaerobic), recovery time, HRV status, performance condition, daily suggested workouts (7 days) |
| Swimming tracking | Pool and open-water swim metrics, stroke type detection, drill logging, rest timers, pacing alerts, pool swim workouts, critical swim speed, underwater wrist-based heart rate |
| Maps & navigation | Courses, course guidance, point-to-point navigation, breadcrumb trail, back to start, TracBack, projected waypoint |
| Activity profiles | running (outdoor, track, trail, ultra, treadmill, indoor track), cycling (biking, mountain, eBike, eMTB, indoor), swimming (pool, open water), triathlon, gym (strength, HIIT, cardio and elliptical, stair stepping, floor climbing, indoor rowing, jump rope), wellness (walking, indoor walking, Pilates, yoga), hiking, archery, SUP, rowing |
| More profiles | racket sports (tennis, pickleball, badminton, squash, table tennis, padel and more); snow (skiing, snowboarding, XC classic); team sports (cricket, football, basketball and more); boxing, MMA; inline skating |
| Multisport | multisport auto transition, auto multisport activities, custom multisport profiles |
| Running | running dynamics (vertical oscillation and ratio, ground contact time and balance, stride length, cadence), running power, grade-adjusted pace, PacePro, race predictor (course- and weather-specific), trail run auto climb, foot pod capable, run/walk/stand detection, track running; lactate threshold (with compatible accessory) |
| Gym | strength, HIIT, yoga and Pilates workouts, on-screen workout animations and muscle map, automatic rep counting |
| Training tools | HR zones and alerts, interval and advanced workouts, auto pause, auto lap, audio prompts, virtual partner, finish time, race an activity, race widget, downloadable training plans, Physio TrueUp |
| Outdoor | UltraTrac mode, Up Ahead, elevation profile, barometric trend with storm alert, vertical speed, total ascent/descent, future elevation plot, sun and moon information |
| Cycling | FTP (with compatible accessory), power meter compatible (Vector and Rally), Varia Vision, radar and lights compatible, speed and cadence sensor support |
Sensors
| Sensors | GPS, GLONASS, Galileo, Garmin Elevate wrist heart rate monitor, Pulse Ox sensor, Barometric altimeter, Compass, Gyroscope, Accelerometer, Thermometer |
|---|
Smart Features
| Notifications | Smart notifications (emails, texts, alerts); text response and reject call with text, view images from notifications (Android only) |
|---|---|
| Music | Controls smartphone music Forerunner 255 Music and 255S Music: on-watch music storage |
| Contactless payments | Yes (Garmin Pay) |
| Emergency SOS / fall detection | Incident detection during select activities, assistance, LiveTrack, live event sharing (Android only) |
| Find my phone | Yes |
| Find My Watch | Yes |
| Other | Morning report |
| Other | Calendar and weather forecasts |
| Other | Stocks (optional Connect IQ app) |
| Battery saver | customisable low-power watch mode |
Battery & Charging
| Battery life (typical) | Forerunner 255, 255 Music, 255S: Up to 14 days (smartwatch mode) Forerunner 255S Music: Up to 12 days (smartwatch mode) |
|---|---|
| Battery life (heavy use / GPS) | Up to 30 hours (GPS-only GNSS mode) Up to 25 hours (all-systems GNSS mode) Up to 16 hours (all-systems GNSS plus multi-band) |
| Charging method | Garmin proprietary plug charger |
In the Box & Warranty
| Box contents | Forerunner 255, charging/data cable, documentation |
|---|
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