Skullcandy Crusher Headphones Dual Driver Immersion:Crusher utilizes two full range 40mm audio drivers, and two additional subwoofer drivers that work together to deliver an immersive audio experience with powerful bass you can feel. Adjustable Haptic Bass: Adjustable bass levels allow you to fine tune your bass experience to find that perfect balance. Wireless Freedom: Bluetooth functionality and up to 40 hours of rechargeable battery life allow you to take the Crusher experience on-the-go. Crusher's rapid charge functionality offers up to 3 hours of listening with just 10 minutes of charging and a full charge at 2.5 hours of charging Refined Acoustics And Noise Isolating Design: The custom-tuned audio drivers deliver rich, refined acoustics that compliment the bass experience, while memory foam ear cups and a noise isolating seal block out distractions and exterior noise. Bluetooth Wireless Controls And Mic: A built-in microphone and on-ear buttons allow you to answer and end calls, change tracks, and adjust volume directly from ear cup.