... call,clear sound,reject call,volume adjustable4.faster connecting ,convenient to listen to MP3 from cellphone.5.Talking time ... 180H6.Internal,nonremovable,rechargeable battery7.No wires,no limits,bluetooth wireless headset8.True freedom talk wirelessly in office ... ,mute function ,more attractive10.CE,FCC,RoHS approvalProduct Specification:Bluetooth Version: v2.1+EDR Profiles: Headset, Handsfree, AVRCP ...