This is no time for compromises. To perform your best you need to hear your best. That’s why we designed the EX-29 headphones with 29 dB of passive isolation. To help you keep the outside world out – and your music in in all its purity. And to stand up to studio- and performance-level extremes. No batteries required. Specifications - Type: Dynamic closed back headphones with closed back drivers. - Passive Attenuation: 36.7 dB at 8 000 Hz NRR 29 dB. - Frequency Response: 20-20 000 Hz. - Fidelity Response: TruSound tonally accurate. - Drivers: 40 mm closed back. - Impedance: 32 O. - Sensitivity: 114 dB at 1 KHz 1 mW. - Cord: 9 ft (2 750 mm) premium twin-lead cable. - Plug: Straight stereo 1/8? (3.5 mm) gold-plated with screw-on 1/4? (6.3 mm) gold-plated adapter. - Rated Input Power: 500 mW. - Maximum Input Power: 1 000 mW. - Weight: 11.5 oz (includes cable and plug). - Warranty: One year. - Red is Right E-Z channel identification. - IncrediFlex padded fully adjustable headband. - User-friendly repairability. - Foldable for storage. - Convenient jack adaptor keeper. - Environmentally responsible natural passive isolation – no batteries required. - Made in the USA.