The Skullcandy S6CRW-K591 Crusher Wireless Over-the-Ear Headphones come with Stereo Haptic Bass which delivers to each side of the head for true left and right variable bass. Adjust the slider on the ear cup to customize the immersive bass experience to your preference or media. Custom-tuned audio drivers deliver rich, refined acoustics to complement the Stereo Haptic Bass across all music. Refined acoustics provide a noise isolating fit that seals out distraction. Up to 40 hours of Bluetooth wireless battery life connects you to your media without tying you to your device. For taking calls, managing music and adjusting volume, the remote and microphone are built right into the ear cup.