AMAZFIT GTR 4, size 46 mm. Zepp OS 2.0 continuously for 14 days.

Screen: AMOLED screen, size 1.43 "Resolution 466 x 466 PPI 326" Health Sensor Biotrachm 4.0 PPG BIOMETRIC SENSOR (Supports Blood Oxygen, 4PD + 2ED) "with 6 GPS, GPS, Golley, QZSS, and Beidou, (Navic Ota Update) and GPS Antenna technology that allows GPS to do more precisely. Even in the forest or the area with a dense building supports the Route Import & Real - Time Navigation function (OTA Update), supports the Smart Recognition function of Strenght Training. Exercise and counting the number of REPS for up to 25 forms (OTA Update) supports up to 150 Sport Mode and 8 Exersense functions. Can test up to 4 health functions, heart rate, Blood oxygen level (SPO2), stress levels, respiratory rates with only one tap It takes only 45 seconds and can measure the heart rate while swimming, waterproof at 5 ATMs. Supports swimming mode, both Pool and Open Swimming. Can measure sleep quality. Light / Deep Slep , REM Stage and Daytime Naps support
Bluetooth Phone Calls and Music Storage functions up to 2.3 GBBATTERY: 475mAh (Typical use) Connect: Bluetooth 5.0, WLAN 2.4GHZAPPLTION: ZEPPPAPATABILITY: Android Com Or ABOVEWARANTY: 1 Year Amazfit Thailand