The first things you will notice about the Blue Mo-Fi Headphones is how LOUD they can be. The headphones have internal batteries that require no maintenance. The only thing they require is charge should you desire to use the amplied modes. The headphones have three settings: OFF, ON, ON+. OFF is what a normal person will use or what you will want to use most of the time if you’re not doing anything intense. This mode is still pretty loud compared to other headphones and it’s fine for everyday use.