Fitbit Charge 3 vs Garmin Vivosmart 4 (large): What is the difference?
Amazon.com: Band Extenders for Compatible with Fitbit Charge HR 6/5/4/3/2/1, Fitbit Sense 2/1 and Fitbit Versa 4/3/2/1 Watch Bands, Extender Bands for Larger Size Wrist or Ankle Wear (Black, Pack of 3) : Electronics
Garmin Vivosmart 4 goes after Fitbit Charge 3 with slim design, pulse ox sensor - PhoneArena