Amazfit Bip is a $99 smartwatch that lasts a month on a single charge
Amazon.com: Amazfit Bip U Pro Smart Watch with Alexa Built-In for Men Women, GPS Fitness Tracker with 60+ Sport Modes, Blood Oxygen Heart Rate Sleep Monitor, 5 ATM Water Resistant, for iPhone
Amazfit - Bip 3 Pro Smartwatch 42.9mm - Black 850037656547 | eBay
Amazfit Bip S Lite Smartwatch Fitness Watch (Charcoal Black) - Walmart.com