I got this (BT325s) as a Christmas gift (I wanted bluetooth headphones). I don't know how it works with my cell phone since I never wanted it for that. It does not work how I wanted it to with anything other than my cell (if it does work ok for that or not). For mp3 player (or anything other than cell phone)you have to use attached plug. I wanted this for using with my tablet etc but the bluetooth part is only for use with cell phone!