Hello @Pds63 and welcome to the Community. All current Fitbit models use a magnetic charging cable. There are magnets in the Fitbit and the charging cable. Please ask your doctor if it is safe to use. I own a Sense 2 and the magnet in the pebble can hold on to tweezers. The magnet in the charging cable seems stronger.
Laurie | Maryland
Sense 2, Luxe, Aria 2 | iOS | Mac OS
Take a look at the Fitbit help site for further assistance and information.