Allen & Heath Xone:XD-53 Professional Monitoring Headphones Excellent sound reproduction;53mm diameter drivers;High power neodymium magnet design High SPL capacity;Rotating earpieces for easy one-ear monitoring;Adjustable metal-reinforced headband Folding design for compact portability; Long listening comfort; Carry pouch included OFC [Oxygen-free Copper] wire cables; 3.5mm [1/8"] connector with 6.3mm [1/4"] jack adapter; Type: Closed-back Dynamic (circumaural isolation design); Frequency Response: 5 - 33,000 Hz; Maximum Input Power: 3,500 mW; Sensitivity: 105 dB/mW at 1 kHz; Impedance: 36 ohms; Weight: 320 g; Cable: 1.2 m (Coiled)/Max. 3.0 m (OFC)