A:AnswerThe "male" connection on the cable for the FitBit Charge has three pins. The "male" connection on the cable for the FitBit Charge HR has only two pins. They are not interchangeable. The packaging on the box obscures the end so it is difficult to see that they are different. It makes no sense that they use different connections but an informed salesperson should know they are different.
A:AnswerPerhaps this will help:
FCC ID 2AHWTS1
FCC ID 2AHWTS1 ID-Label-Location-Info, 2AHWT S1, 2AHWTS1, 2AHWTSI, 2AHWT51
Bean Information Technology Co., Ltd. Smartwatch S1