This product is make of 5 buttons, power on/off,play/pause, volume+,volume-,forward,backward Supports AV stereo music receive A2DP(Advanced Audio Distribution Profile) Supports Remote control AVRCP(Audio/Video Remote Control Profile) Supports headset profile Supports hands-free profile Adjustable volume for computer, mobile phone, player by volume+,volume- buttons, play,pause for computer, mobile phone,player by play/pause buttons, though forward,backward buttons can control forward/backward songs Supports voice calling Re-dial the latest calling number Works frequency 2.4Ghz to 2.48 GHz Supports profiles Headset profile/hands-free profile RF output power down 6 to up 4dBm (Class 2) RF sensitivity down 85dBm Output Power10w & 10w & 15w SNR up 85dBm