1 Year Manufacturers Warranty from authorized dealers (Amazon or 4OurEars)</br>3.5mm mini plug with 1/4 inch adapter</br>Open Air Operating Principle</br></br>Product Description</br></br>Everyone loves a thumping bass and kick-drum?? but not at the expense of everything else. The Grado SR60e is your entry to the world of full spectrum audio. You'll actually hear notes you never knew were there. Perhaps your audiophile friends have fueled a desire for the legendary Grado sound but you thought it was out of reach. Try a pair of our affordable open-back headphones and experience fuller?? more realistic sound. Club-foote