Fitbit Charge review: An improved band, but lacking heart rate - CNET
Best Buy: Fitbit Charge 2 Activity Tracker + Heart Rate (Small) Black Silver FB407SBKS
Amazon.com: Fitbit Charge 6 Fitness Tracker with Google apps, Heart Rate on Exercise Equipment, 6-Months Premium Membership Included, GPS, Health Tools and More, Obsidian/Black, One Size (S & L Bands Included)