Specification Forerunner 265 Forerunner 265S Lens Material Corning® Gorilla® Glass 3 Corning® Gorilla® Glass 3 Bezel Material Fiber-reinforced polymer Fiber-reinforced polymer Quick Release Bands 22 mm (Industry standard) 18 mm (Industry standard) Strap Material Silicone Silicone Physical Size 46.1 x 46.1 x 12.9 mmFits wrists with a circumference of 135-205 mm 41.7 x 41.7 x 12.9 mmFits wrists with a circumference of 115-178 mm Touchscreen Yes Yes Color Display Yes Yes Display Size 1.3" (32.5 mm) diameter 1.1" (28.1 mm) diameter Display Resolution 416 x 416 pixels 360 x 360 pixels Display Type AMOLED with optional always-on mode AMOLED with optional always-on mode Weight 47 g 39 g Water Rating 5 ATM 5 ATM Battery Life Smartwatch mode: Up to 13 daysGPS-only GNSS mode: Up to 20 hoursSatIQ (AutoSelect) GNSS mode: Up to 16 hoursAll-Systems GNSS mode + Multi-Band: Up to 14 hoursGPS-only GNSS mode with music: Up to 7 hoursSatIQ (AutoSelect) GNSS mode with music: Up to 6.5 hoursAll-Systems GNSS mode + Multi-Band with music: Up to 6 hours Smartwatch mode: Up to 15 daysGPS-only GNSS mode: Up to 24 hoursSatIQ (AutoSelect) GNSS mode: Up to 18 hoursAll-Systems GNSS mode + Multi-Band: Up to 15 hoursGPS-only GNSS mode with music: Up to 7.5 hoursSatIQ (AutoSelect) GNSS mode with music: Up to 7 hoursAll-Systems GNSS mode + Multi-Band with music: Up to 6 hours Charging Method Garmin proprietary plug charger Garmin proprietary plug charger Memory/History 8 GB 8 GB Both models offer advanced health monitoring features, including wrist-based heart rate monitoring, Pulse Ox blood oxygen saturation tracking, Body Battery energy monitoring, and advanced sleep monitoring with sleep score and insights. They also support multiple satellite systems (GPS, GLONASS, Galileo) with multi-frequency positioning and SatIQ technology for enhanced accuracy. Additional features include built-in sports apps, daily suggested workouts, training readiness scores, and smart notifications. Music storage and playback are also supported, allowing for phone-free listening during activities.