Brand - Amazfit, Model - Amazfit GTR 2 New Version, Watch Size - 46mm, Cellular Network - No, SIM Card Slot - No, SIM Card Type - No, Dial Shape - Round, Dial Type - Digital, Processor /CPU - No, Chip - No, Display Size - 1.39 Inch, Display Type - Amoled HD Display, Display Resolution - 454 x 454, Display Protection - Tempered glass, Anti-Fingerprint Vacuum Coating, Display Brightness - Not Specified, Display Area - Not Specified, Multitouch - Not Specified, 3D Touch - No, Ram & Memory - Not Specified, Storage - Not Specified, Camera - No, Calling Feature - No, Loudspeaker - No, Microphone - No, Sport Modes - 90 Sport Modes, Waterproof - Yes, Waterproof Rating/Level - 5ATM, Water Resistant - Yes, Dustproof - No, Shockproof - 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, Optical Heart Sensor - No, Activity Tracker - Yes, Vibration - No, Button - 2, Card slot - No, Wi-Fi - No, Wi-Fi Type - No, Bluetooth - Yes, Bluetooth Version - Bluetooth 5.0, Data Sync Compatibility - Zepp App, NFC - No, GPS - Yes, Connectivity - Bluetooth, GPS, WLAN 2.4GHz16, Battery - 471mAh, Working Temperature - Not Specified, Charging Method/Port - Magnetic Charging Stand, Build - 22mm Silicone Strap Quick release., Body Materials - Aluminum Alloy, Body Color - Grey, Band Color - Grey, OS & Version - Android 5.0 or iOS 10.0 and above, Watch Dimension - 46.4 x 46.4 x 10.9mm, Weight - 32 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: Clasp: Classic Pin Buckle., 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., Part No - Not Specified, Warranty - 1 Year (Warranty should be claimed with box including all accessories), Country of Origin - China, Made in/ Assemble - China