Amazfit GTS 4 - Infinite Black

1.75" (390x450) AMOLED, Always-On Display, Aluminum alloy + Plastic body, 9.9mm thin, 27g lightweightBioTrackerTM 4 PPG (4PD + 2 LED), acceleration sensor, gyroscope, geomagnetic sensor, air pressure sensor, ambient light sensorDual-band positioning and support for 6 satellite positioning systems, Dual-band circularly-polarized GPS antenna technology, 5 ATM, 300mAh Battery, BT5.0 + Wi-Fi150+ sports modes, Smart recognition of 8 sports, Route Import & Real-time Navigation, Real-time Movement Tracking, Direct Return Navigation, Smart recognition of 25 strength training exercises, Track Run mode, Interval Training Templates, PeakBeats™, Live broadcast of sports data, Virtual Pacer, 24hr heart rate, High & low HR alerts, 24hr SpO2 monitoring, Low SpO2 alerts, 4 health metrics in 1 tap, Sleep monitoring with REM & naps, Sleep breathing quality, Sleep schedule, Morning updates, Stress monitoring, High stress alerts, Breathing rate, Breathing exercise, Menstrual cycle, PAI, Body power score, Alexa built-in, Offline voice assistant, 8-day battery life, Music storage, Bluetooth phone calls, New Zepp OS 2.0 with mini apps & third party apps support as well as new addition of games, Classic navigation crown.Strap: Width: 20mm, wrist circumference: 140-200 mm