Amazon.com: Amazfit Band 7 Fitness & Health Tracker for Men Women, 18-Day Battery Life Black & Band 5 Activity Fitness Tracker with Alexa Built-in, 15-Day Battery Life, Blood Oxygen, Heart Rate, Black :
Xiaomi Amazfit GTR 47mm Titanium - Smart homes - smartphone control
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Battery for Xiaomi Amazfit T-Rex, A1919 - 400 mAh / 3.8 V / 1.48 WH
Amazon.com: Amazfit Bip S Lite Smart Watch Fitness Tracker for Men, 30 Days Battery Life, 1.28”Always-on Display, 14 Sports Modes, Heart Rate & Sleep Monitor, 5 ATM Water-resistant, for Android iPhone(Blue) :