Etymotic Research HF2 hf2 High Fidelity Hands-Free Headset - Ruby

The Etymotic hf2 is a high-fidelity hands-free Headset that is compatible with the Apple iPhone and other Mobile phones. The hf2 earphones are the next best thing to live music, with noise isolation far surpassing that of active noise-canceling earphones. Their external noise exclusion allows you to hear the full dynamic range of recordings without having to play them at unnaturally high and unsafe levels. There is a built-in Microphone in the middle of the headset. The microphone features a single button for answering and ending call. For music listening, press first click for music pauses, second click to skip to next track and third click to go back to previous track. With a regular 3.5mm Stereo plug, it is compatible with most mobile phones and music players, also. With the response accuracy of a reference level earphones and the highest noise isolation of all competing headsets, this is the best Hands-Free headset period.

Box Contents: High-fidelity, hands-free, noise-isolating headset + earphones with 4 ft. cable, Assorted eartips, Filter tool with 2 replacement filters, Storage pouch

Compatibility - iPhone (2.5 and 3G versions), Blackberry Curve and other music smartphones with a 3.5mm/4-contact phone + stereo plug; Compatible with most music players (e.g., iPod, mp3, CD) that accept a 3.5 mm stereo plug.

Frequency response: 20 Hz -16 KHz

Noise isolation: 35- 42 DB (depending on eartip used)

Acoustic polarity: + electrical = + acoustic

Transducer type: Balanced armature

Sensitivity (1 kHz): 105 dB SPL for a 0.1 VRMS input

Impedance: 16 Ohms (nominal)

Maximum output: 120 dB SPL

Maximum continuous input: 0.55 VRMS

Microphone sensitivity: -40 dB V/Pa

Cable: 4 feet

Weight: 1.3 oz

hf2 headset + earphones exclude most external sounds. While driving, always leave one ear open. It is unsafe to use in-ear earphones while operating a motorized vehicle, operating machinery, bicycling or jogging, because you may not be alerted to potential danger.