The CAD NB-2 Active noise canceling headphones are professional grade in-ear monitors with superb sound quality. They use a High output 9mm driver with neodymium magnet for clear, robust audio and are Great for travel and music listening in challenging sound environments. The are compatible with Blackberry, I pod, I phone, mp-3 and any portable music listening device. Included with the NB-2 headphones are an 1/8 inch mini stereo plug and 1/4 inch stereo plug and airline adapter and three different sizes of earbuds for precision fit and maximum performance. Storage gig bag and battery included.