It’s a Volume Control Indicator.As soon as you change your volume from a button it shows a volume meter that makes much easier to have full control of your speakers.Also,it comes with 8 changeable skins.
Depending on the manufacturer, some sound cards and laptops come with a eye candy on-screen volume control indicator software. Even though it can be useful, many users have no choice but to use the default Windows Volume Control options. After all, what’s the point of having an eye candy interface without any functionality?
You can change the buttons you want to set for volume control.