Earbuzz: bundled earphone essentials (or bluetooth earphone which have volume key) + gesture control ** support gesture : shaking , phone head down, lift your phone higher **Tested bluetooth headset : JBL E25BT You can use the volume keys to operate previous songs that are not in the bundled earphone. We supports Google Play Music and etc. music app. After installing our app and plugging in the earphone Pressing the volume key (down) twice quickly will activate the function for all songs