FLIPS Audio XB Headphone Speakers Flip ear cups in for headphones, out for speakers! Just flip the convertible ear cups out for powerful sound in speaker mode! Lightweight, over-ear design 40mm neodymium drivers deliver amplified High-def sound Built-in resonator for extra bass Unique safety technology amplifies sound only in speaker mode Lithium-polymer battery and USB rechargeable for hours of playtime Inline music controls and mic so you never miss a call Detachable cord and sleek, folding design for easy storage FLIPS XB transforms how you listen to your music. Listen in solo mode, with the ear cups to your ears, or flip them out to turn them into a portable boom box. Adjustable headband Includes travel case with carabineer clip, USB cable and detachable audio cable