Open the Fitbit app
Tap your profile picture
Select your Fitbit device
Tap Notifications
Turn off the notifications you want to disable
Turn off All-Day Sync
Turn off Bluetooth on your phone
On the Fitbit device, open Settings
Select About
Select Shutdown or Power Off, if available
Press and hold the device button until the screen turns off, if your model supports it
Let the battery drain completely if the device has no power-off option