Brand - Amazfit, Model - Amazfit GTR 2 Classic, Watch Size - 46mm, Cellular Network - No, Dial Shape - Round, Display Size - 1.39 Inches, Display Type - Amoled HD Display, Display Resolution - 454 x 454, Display Protection - Tempered glass + Anti-Fingerprint Vacuum Coating, Camera - No, Loudspeaker - Yes, Microphone - Yes, Sport Modes - 90 Sport Modes, Waterproof - Yes, Waterproof Rating/Level - 5 ATM, Water Resistant - Yes, Dustproof - No, Blood Pressure - No, Blood Oxygen - Yes, Heart Rate - Yes, Sensors - Health: Self-developed BioTracker 2 PPG (support blood-oxygen) biological data sensor, Movement: Air pressure sensor Acceleration sensor Gyroscope sensor 3-axis geomagnetic sensor Ambient light sensor, Positioning: GPS + GLONASS, Electrical Heart Sensor (ECG App) - No, Activity Tracker - Yes, Button - 2, Card slot - No, Wi-Fi - No, Bluetooth - Yes, Bluetooth Version - Bluetooth 5.0, GPS - Yes, Connectivity - Bluetooth, WLAN 2.4GHz16, Battery - 471 mAh, Charging Method/Port - Magnetic Charging Stand, Body Materials - Stainless Steel, Body Color - Silver, Band Color - Silver, OS & Version - Android & iOS, Watch Dimension - 46.4 x 46.4 x 10.7mm, Weight - 39 gm, Others - Display PPI: 326, Linear Motor: Support, Charging Time About: 2.5 hours, Typical Usage Battery Life: 11 days, Basic Usage Battery Life: 38 days, Heavy Usage Battery Life: 6.5 days. Strap: Material: Silicone or Leather, Quick release, Width: 22mm, Clasp: Classic Pin Buckle. Supported Devices: Android 5.0 or iOS 10.0 and above, Application: Zepp App., Features - The Amazfit GTR 2 is equipped with the self-developed BioTracker, the second-generation PPG bio-tracking optical sensor, allowing it to perform 24-hour heart rate monitoring. It covers heart rate zones and provides warnings when your resting heart rate is abnormally elevated, keeping you aware of the exercise effect and reducing exercise risks. Blood-oxygen Saturation Measurement. Comprehensive Health Understanding. The Amazfit GTR 2 includes a microphone and speaker to let you answer calls on your watch when it`s inconvenient to pick up your mobile phone. Connect the GTR 2 to your mobile phone via Bluetooth to ensure that you no longer miss important calls. Intelligent Voice Assistance. Liberate Your Hands. Quick Access Functions. Swipe Left for Intelligence, Right for Convenience., Warranty - 1 Year (Warranty should be claimed with box including all accessories), Country of Origin - China, Made in/ Assemble - China