BLUETOOTH 3.0 BLUETOOTH INTERCOM UP TO 200 METERS (220 YARDS)* BLUETOOTH PAIRING FOR DUAL MOBILE PHONES - VOICE PROMPTS BLUETOOTH STEREO HEADSET BY A2DP BLUETOOTH MUSIC PLAYBACK CONTROL BY AVRCP: PLAY, PAUSE, TRACK FORWARD AND TRACK BACK EASY OPERATIONS BY TWO-BUTTON SUFFICIENT SOUND LEVEL WITH INTEGRATED AUDIO BOOSTER BLUETOOTH HANDSFREE FOR BLUETOOTH MOBILE PHONES CRYSTAL CLEAR AND NATURAL SOUND QUALITY UP TO 8 HOURS TALK TIME, 7 DAYS STAND-BY TIME INDIVIDUAL VOLUME CONTROL FOR EACH AUDIO SOURCE INSTALLATION FRIENDLY UNIBODY DESIGN FIRMWARE UPGRADEABLE SIZES: MEDIUM (52-58) - LARGE (60-64)