Great charger. I had been trying to charge my Fitbit Sense with variable results for sometime now. Sometimes it charged partway then started draining partway through, sometime it took more than a day to charge, sometimes seven or eight hours. At first I thought because my Fitbit was getting older, it couldn’t hold a charge anymore. I decided to try a replacement charger before giving up on my Fitbit Sense. Whoohoo, I put the watch on the new charger, checked it less than two hours later and it was fully charged!! Definitely happy with product so far.