HEDD HEDDphone Two GT Unplugged; passive hi-fi headphones; open-back design; no cable included; over-ear construction based on HEDDphone TWO; equipped with Air Motion Transformer (AMT) and multi-layer Kapton polyimide diaphragm; Variable Velocity Transformation (VVT); frequency response: 10Hz – 40kHz; max SPL: 88dB @ 1mW; impedance: 41O; adjustable headband (height, width, curvature, clamping pressure); velour ear pads; made from carbon fiber and magnesium for reduced weight; connectors: dual 3.5mm mono jacks; includes travel case; weight: 550g