is controlled by using Bluetooth. If and when you are done using the headset, you should turn the Bluetooth off in the phone. It will help to save your batteries and also when you turn the Bluetooth off, the music will no longer go to the headset.
Hope this helps.
hey i just got the LG enV. i also bought the music essentials kit. the headphones plug into the charger slot, but when i close the phone like the instructions tell me to...it keeps playing through the speakers. am i doing something wrong, or do they just not work?