HEDD HEDDphone Two Unplugged; studio headphones; open-back design; no cable included; over-ear construction with Air Motion Transformer driver and Variable Velocity Transformation (VVT); frequency response: 10Hz – 40kHz; max SPL: 89dB @ 1mW; impedance: 41O; adjustable headband (height, width, curvature, clamping pressure); PU vegan ear pads and head cushion; made from carbon fiber and magnesium for reduced weight; connectors: dual 3.5mm mono jacks; includes travel case; weight: 550g