USED Devices and Buttons Display Digital Crown‏ Microphone with noise cancellation‏ Side button Strap release button Electrical heart sensor Speaker/vent Blood oxygen sensor and optical heart sensor Controls Digital Crown with haptic feedback Side button Double-press gesture Siri‏ Chip S10 chip with 64‎-bit dual-core processor SiP‏ Quad-core Neural Engine 64GB capacity Sensors Electrical heart sensor Blood oxygen sensor Third-generation optical heart sensor Temperature sensor1 Compass Always-on altimeter High-g accelerometer High-dynamic-range gyroscope Ambient light sensor Depth sensor Water temperature sensor Health and Wellness ECG app2 Cycle Tracking app with ovulation estimates based on previously observed data3 Heart rate app High and low heart rate notifications Irregular rhythm notifications4 Blood Oxygen app5 Medications app Mindfulness app with mood tracking Noise app Sleep app including sleep stages Sleep apnea notifications6 Display Always-On Retina LTPO3 OLED display Wide OLED Up to 40% brighter when viewed from an angle Edge-to-edge screen Ion-X glass display (aluminum cases) Sapphire crystal display (titanium cases) Peak brightness up to 2000 nits Minimum brightness of 1 nit 326 pixels per inch Audio Speaker Media playback Workouts and Activity Running Custom workouts Customizable workout views Training load Heart rate zones Race route Pace setter Stride length, ground contact time, and vertical oscillation Multi-sport workout Hiking Compass with direction, gradient, elevation, and coordinates Custom waypoints Automatic waypoints based on cellular connection GPS data for return route Offline maps with custom route creation Topographic maps for thousands of national and regional parks (US only) Hundreds of carefully curated hikes across 63 US national parks Cycling Average speed, elevation gain, and distance Connect to cycling accessories via Bluetooth Maximum power Power zones Pace Live activity on iPhone Swimming Pool swimming or open water swimming Custom pool swimming workouts Lap timing and automatic set adjustment SWOLF metric Automatic stroke detection Kickboard detection Average speed, total distance, and laps More workouts Skiing Snowboarding Rowing Kayaking Golf Walking Elliptical Rowing machine Stair climber High-Intensity Interval Training (HIIT) Yoga Functional strength training Dancing Cool-down Core training Pilates Tai Chi workout Chair push workout Kickboxing Multi-sport workout Other workouts Safety Emergency SOS‏9 Worldwide emergency calls10 Crash Detection9 Fall Detection Noise monitoring Route Condition: Used Series: Apple Watch Series 10 Connectivity: GPS + Cellular Color: Blue