Ultrasone HFI-15G S-Logic Surround Sound Headphones Theselightweight headphones can follow you easily. Youbarely feel it when you wear them. The open-back design of the HFI-15G is highly appreciated for mobile applications or as hearing aid for watching TV. This is the smallest headphone of the UltrasoneHFI line, convincing with its pure and spacious sound. Features: * Open, supra-aural headphones * Technologies: S-Logic Natural Surround Sound & Safer hearing Specifications: S-Logic Natural Surround Sound Dynamic principle Frequency range 20-20.000 Hz Impedance 32 Ohm Sound pressure level 96 dB Driver 40 mm Mylar Weight 85 g (without cord) Straight cord (length ca1m) with gold-plated jack 3,5mm incl. 3,5/6,3mmadaptor and extension cord (ca 4m) Long-term availability of spare parts