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Amazon.com: Amazfit GTR 3 Smart Watch for Men, 21-Day Battery Life, Alexa Built-in, 150 Sports Modes & GPS, 1.39”AMOLED Display, SpO2 Heart Rate Tracker, Water Resistant, Fitness Watch for Android iPhone, Black :
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Amazon.com: Amazfit GTR 4 Smart Watch for Men Android iPhone, Dual-Band GPS, Alexa Built-in, Bluetooth Calls, 150+ Sports Modes, 14-Day Battery Life, Heart Rate Blood Oxygen Monitor, 1.43”AMOLED Display,Black : Cell Phones
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