What makes Oneida adapter-free DJ headphone a good headphone?? sound ? comfort ? foldable design studio Pro is a flexible headphone that can be naturally adjusted to any sized head, big or small. The cups rotate both left and right and up and down, it is light-weight also, about 263G, so it's convenient to be fold up and put in a carrying case. ? dual-duty cable ? durability technical Specifications: 3. 5mm output interface rated power: 20Mw power handling capability: 30mwfrequency response: 20Hz-20KHz : 1 year. Oneida technology focuses on creating the best sound experience.