Fitbit Charge 3 review: great fitness, just enough watch - CNET
Fitbit Charge 4 Fitness and Activity Tracker with Built-in GPS, Heart Rate, Sleep and Swim Tracking, Black, One Size (Small and Large Bands Included) - Walmart.com
Fitbit Charge 4 Fitness and Activity Tracker with Built-in GPS, Heart Rate, Sleep and Swim Tracking, Black, One Size (Small and Large Bands Included) - Walmart.com