How long should I charge ZeFit for the first time ? December 08, 2014 13:49 We recommend charging it during 1:30 to 2 hours. Related articles After I remove ZeFit from its charger, ZeFit screen remains black ? I have plugged ZeFit to my computer but it seems that it is not charging, no battery indicator shows up? I have installed ZeFit PC software but I am stuck on the welcome page ... I cannot see ZeFit in the list of Bluetooth devices of my mobile phone Where can I find ZeFit Windows Phone App?