PATENTED MULTI-SENSORY CRUSHER BASS TECHNOLOGY. Featuring two full-range 40mm audio drivers plus additional dual bass drivers, your music and movies will come alive with a sound experience you can actually feel UP TO 40 HOURS BATTERY + RAPID CHARGE. Listen to your music for days with up to 40 hours of battery life. With Rapid Charge, just 10 minutes of charging gives you 4 hours of listening PERSONAL SOUND IN THE SKULLCANDY APP. Download the app and participate in a hearing analysis that automatically adjusts the sound levels for your specific hearing CALL, TRACK AND VOLUME CONTROLS. Answer or reject calls, adjust volume, skip forward or repeat tracks with convenient button controls BUILT-IN TILE FINDING TECHNOLOGY. Find your headphones near and far when you register your product in the Tile App FLAT-FOLDING AND COLLAPSIBLE DESIGN. For enhanced headphone portability and convenience without sacrificing durability