Amazon.com: Hamile Bands Compatible with Fitbit Charge 4 / Fitbit Charge 3 / Fitbit Charge 3 SE, Waterproof Replacement Watch Strap Fitness Sport Band Wristband for Women Men, Large, Black : Electronics
Fitbit Charge 3 & 4: How to Fix Black Screen (2 Easy Fixes!!!) - YouTube
Fitbit Charge 3 is waterproof and features a full touchscreen, leak suggests