Was comp'ed this package by Amazon because one of the 2 T637's I bought was missing it's handsfree earpiece. Kudos to Amazon on the customer service but the plug on this hands free adapter is to big to allow either the Sony wall charger or the car one that comes with this! (The place you most likely would use the handsfree is the car... where you most likely would plug in the car charger! Duh!)Glad I didn't have to pay for it.