Automatic Headphone Volume

Background:
There are similar apps in the market, but most of them are either too power consumption or unable to react after running for a period (maybe program terminated by andorid system).
Due to this reason, the author tailor make a program with the Android Event Driven Technique, there is totally no power consumption and promise to you with round the clock operation.
The app needs to be shown in notification bar in order to have no power and resource consumption from your device while still capable to maintain auto volume switch when headset/headphone was plugged or unplugged.

Feature:
Automatic adjust cell phone speaker volume and headphone volume to a preset value, the app will auto detect the plugging of headphone / headset, this can help save your time and protect your hearing and ear from loud volume such as Ringing while you are listening to music with headphone.

Symptoms to note:
Android will auto adjust some of the channel volume base on other volume adjust by user.
Android will vibrate on calls even user may have set vibrate off in the app, this is due to supersede setting of phone call inside Settings.