Unique open headphones with great sound quality. This lightweight headset has remained unchanged in design since 1984. Still considered as a reference in lightweight headphones. Porta Pro has won several tests and with its bell-clear sound reproduction, given much joy to music lovers through more than 25 years. Adjustable headband, both in size and pressure on the ears. Foldable headphone which facilitates the transport. Practical bag included. - Frequency response: 15-25000 Hz - Impedance: 60 ohms - Sensitivity: 101 dB SPL / 1 mW - Plug: 3.5 mm, 6.3 mm adapter - Cable length: 120 cm - Distortion: <0.2% - Weight: 80 g