Skullcandy Crusher Bluetooth Wireless Over-Ear Headphone with Microphone, Noise Isolating Memory Foam, Adjustable and Immersive Stereo Haptic Bass, Rapid Charge 40-Hour Battery Life, Black 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 Adjustable haptic bass levels allow you to fine tune your bass experience to find that perfect balance. Features passive noise isolation. Frequency response is 20 hertz to 20 kilo hertz Wireless freedom: Bluetooth functionality and up to 40 hours of rechargeable battery life allow you to take the Crusher experience on-the-go Refined acoustics and noise isolating design custom tuned audio drivers deliver refined acoustics that compliment bass with ear-cups and 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. Crushers 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