The hf2 is a high-fidelity, hands-free noise-isolating headset and earphones combination. But it's really much, much more than that. The hf2 provides a near-perfect music experience. Made by Etymotic Research, the people who created in-ear earphones, the hf2 delivers Etymotic's world-renowned sound quality in a comfortable, convenient wireless phone headset, so you'll never miss a call! The HF2 is perfect for your music and movies, as well as for clear, distortion-free voice calling Earphone response is measured on a KEMAR® mannequin with the same acoustic properties as the average head and ear. The headset includes an in-line microphone and a Music/Call button that allows you to quickly answer calls while contolling your music. You'll be able to hear and be heard, clearly, even in a noisy environment. The hf2 includes the in-ear headset and earphones, assorted eartips so you can find the ones that fit you best, carry pouch and filter changing tool with filters. Works with iPhone and other music phones that operate with a 3.5 mm/4-contact phone + stereo plug. Compatible with most music players (e.g., iPod, mp3, CD) that accept a 3.5 mm stereo plug. hf2 headset + earphones can be worn with the cables in front or in back of the head. The cable slider can be adjusted by moving it up or down for a snug fit. What They're Saying "On the whole, sound quality is excellent at this price. Each balanced armature driver responds to frequencies between 20Hz and 16KHz -- about average -- producing a clean sound, with tight highs, bold mids and a clear, smooth bass riding underneath. John Otto's drums on Limp Bizkit's early album Significant Other are, sound wise, one of our favourite studio drum recordings. Through the hf2's, the skull-crushing snare drum rim shots pounded our ears into dust, while tight hi-hat rudiments shone with gorgeous clarity." -- Nate Lanxon, CNet.co.uk How Etymotic Research Measures Response Accuracy The accuracy score is perhaps the single most important tool for earphone design. A perfect recording of a live performance played through earphones with 100% accuracy would produce the same sound at the eardrum as the live performance. A complicating factor is that the acoustic resonance and horn effects of the ear change a flat signal entering the open ear to an eardrum signal with the approximate frequency characteristic of the target curve. A perfect earphone will create that same frequency characteristic at the eardrum. Target Curve Target curves on Etymotic Research graphs indicate 100% accuracy: The open ear diffuse-field response of the KEMAR® mannequin modified to compensate for the high frequency boost added to high-quality recordings. This modification (approximately 5 dB at 10 kHz) is necessary to avoid earphones sounding too bright on commercial recordings. Commercial recordings have a high-frequency boost that compensates for the high frequency roll-off in studio monitor loudspeakers and high-quality stereo loudspeakers and earphones. Earphone response is measured on a KEMAR® manikin that has the same acoustic properties as the average head and ear. 25-band accuracy scores are calculated by summing the difference between the earphone response and the target response in each 1.3 -octave band from 50 Hz to 12.5 kHz. In the 1970s, Consumers Union used an "Accuracy Score" to rate loudspeakers. Consumer Reports reported that it was possible to predict listeners' loudspeaker ratings within 8% from a calculation based on one-third-octave frequency response measurements converted to loudness in sones. The average error in loudness from a perfect system, subtracted from 100%, gives the accuracy score. Etymotic Research extended this 21-band calculation to a 25-band calculation and routinely uses the 25-band accuracy score in all earphone designs. Other in-the-ear earphone manufacturers do not report accuracy scores, but Etymotic Research has tested all competitive products. The accuracy scores of Etymotic Research earphones are higher than those of most loudspeakers, and well above all competitive earphones, except electrostatic headphones that cost thousands of dollars. Product Description PRODUCT FEATURES:Compatible with iPhone and other mobile phonesResponse accuracy of Etymotic's ER-4 earphonesHighest noise isolation of all competing headsets3.5mm stereo plug makes the hf2 compatible with any music player High-fidelity | Hands-free headset + earphones * Compatible with iPhone and other mobile phones * Response accuracy of Etymotic's ER-4 earphones * Highest noise isolation of all competing headsets * 3.5mm stereo plug makes the hf2 compatible with any music player Includes: * High-fidelity, hands-free, noise-isolating headset + earphones with 4 ft. cable * Assorted eartips * Filter tool with 2 replacement filters * Storage pouch Compatibility Works with: • iPhone (2.5 and 3G versions), Blackberry Curve and other music phones with a 3.5mm/4-contact phone + stereo plug • nano4G** **nano4G Application Music listening 1 click = music pauses (another click resumes music) 2 clicks = skip to next track 3 clicks = go back to previous track Voice memos Turn on recording mode Click mic pod button to pause/resume recording Voice memos can be saved to iTunes library by connecting nano4G to a computer   0% Details   SKU ER-HF2-RUBY Weight 0.30 kg Frequency Response 20 Hz -15 kHz Sensitivity 105 dB SPL for a 0.1 VRMS input Noise Isolation 35- 42 dB (depending on eartip used) Maximum Output 120 dB SPL Transducer Balanced armature Impedance 16 Ohms (nominal) Weight 37g Price: $ 269.00 Options   Select Colour Black Cobalt Ruby Quantity 1 2 Add to cart          Add to wish list Etymotic Research ER-6 isolator In-ear Earphone Etymotic Research ER-6i Isolator In-ear Earphone Etymotic Research ER-4 Series MicroPro In-ear Earphone Etymotic Research ER•20 High Fidelity Hearing Protection Phonak Audeo Perfect Fit Earphones for iPod and Other Portable Music Players Phonak Audeo Perfect Fit Earphones with Microphone for iPhone, BlackBerry, etc Product comparison  Add to comparison list

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