Ultrasone DJ 1 S-Logic Plus Surround Sound Professional Closed-backDJ Headphones with Transport Bag Logic Natural Surround Sound^Dynamic principle^Frequency Range 10 - 22.000 Hz^Impedance 32 Ohm^Sound pressure level 104 dB S-Logic(TM) Natural Surround Sound for a more natural, lifelike sound Safer listening, less fatigue - SPL levels to the ear drum are decreased by up to 40% (3-4dB) for the same perceived loudness ULE technology with MU Metal shielding to reduce radiation by up to 98% as compared to ordinary headphones 50mm professional durable Mylar driver provides high volumes and superb isolation 1/8 inch gold plated plug, gold plated screw adaptor, demo CD, and carry bag included