These lightweight headphones can follow you easily. You barely feel it when you wear them. The open-back design of the Ultrasone HFI-15G is highly appreciated for mobile applications or as hearing aid for watching TV. This is the smallest headphone of the Ultrasone HFI line, convincing with its pure and spacious sound. Through the S-Logic Natural Surround Sound the usual headphone sound will be moved out of the head in the room around you. The sound is no longer locked in, but appears broad and detached. Directions and distances can be heard and perceived - it?s just like being in a live concert. For this new technology additional equipment is not required. Take a pair of Ultrasone headphones plus your sound device and you will be ready for the 3-dimensional sound enjoyment! S-Logic does not only create a Natural Surround Sound. S-Logic allows at the same time a reduction of sound pressure levels by up to 40% (3-4 dB) for the same loudness sensation. This may reduce the risk of hearing damage while ensuring hours of fatigue-free listening. However, Ultrasone generally advises not to listen to music at high volumes to prevent hearing damage. Featuresof theUltrasone HFI 15G: Open, supra-aural headphones S-Logic Natural Surround Sound Safer hearing 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 ca 1m), extension cable length 4m Long-term availability of spare parts Included Accessories 3.5mm to 6.3mm Stereo Adapter, Extension Cable Connector Type 3.5mm, Straight Cable Length (m) 1 Cable Type Single sided Impedance (ohm) 32 Frequency Response (Hz) 20-20000 Sound Pressure Level (dB) 96 Form Supra-aural Ear Cup Open back Driver Type Dynamic Driver Diameter (mm) 40 Compatibility All Ipods, All Standard MP3 Players Top 10 Reasons to use Ultrasone 1. S-‐LogicTM Natural Surround Sound: The sound is moved out of the head in the room around you. The sound appears broad and detached. Directions and distances can be heard and perceived - as if you're in a live concert or in the sweet spot of fine monitor speakers. 2. Less hearing fatigue: Listening (or working) with headphones causes hearing fatigue rather quickly (ouch my ears hurt). With S-‐Logic the sound into your individual ear reduces hearing fatigue close to zero. 3. Hear more details: One of the most important facts for the working musician, engineer, or producer! You are able to hear more detail and nuances. For a consumer, you'll discover hidden gems you never heard before. 4. Safer hearing: S-‐LogicTM reduces sound pressure levels (3-‐4 dB) up to 40% for the same perceived loudness. This may significantly reduce the risk of hearing damage -‐ a must if you spend a lot of time in headphones. 5. Patented ULE Technology: Ultra Low Emission: Unlike other headphones, with ULE you have *radiation protection. Electro-‐magnetic emissions are cut to approximately 98%. Without ULE it's as if you put 5 computer CRT monitors directly on your head. ULE is very important. 6. Design: Reviewers have spoken glowingly and use words like "upscale and elegant" and have written, "...the combination of high style and stellar sound are hard to beat." All are incredibly comfortable and have a professional and cutting edge look. 7. Choice of materials: Edition headphones are made of the finest materials available. But all through the ULTRASONE brands, meticulous care is taken about the materials used. 8. Great Craftsmanship: Great build quality, reasonable weight, precision-‐engineered and an incredibly low failure rate. 9. Warranty: 5-‐year transferrable limited warranty with receipt of purchase. ULTRASONE is that good. Need we say more? (2 Additional years on the Edition products with the mailing in of the warranty card) 10. Philosophy: No other brand concentrates on just headphones, has 60 patents worldwide, designs products with accuracy for the pro, consumer, and audiophile market. * not on the HFI 450 and the HFI 15G