Mac にも Fitbit Connect をインストールしたら "You have a One linked to this Fitbit account. Only a single tracker can be linked to a Fitbit account." て。 [t]2013-01-04 16:19:34
4桁の番号が Fitbit one に表示されるから Fitbit Connect に入力して認証完了。 "We found a Fitbit One! Do you see a number starting with 0? Enter the number below." [t]2013-01-04 16:21:58