6i isolator earphones are designed specifically for use with the Apple iPod and other small portable players, offering 8 dB higher overall sensitivity and slightly more bass than the ER-6 isolator earphones.
For Travel and Personal Listening

• Use with MP3, CD, DVD players and personal computers
• Lightweight, compact, fits in your pocket; no battery required
• Highest noise isolation (except Etymotic's ER-4 MicroPro earphones)

System Includes

• ER•6i Isolator earphones
• 5 ft. cord with 3.5 mm stereo plug
• 1 pair white 3-flange eartips
• 2 replacement filters
• Filter changing tool
• Shirt clip
• Pouch

Specifications

• Frequency response: 20 Hz to 16 kHz
• Tolerance: ±3 dB to 6 kHz, ±6 dB to 16 kHz re nominal
• Transducer type:
• Balanced armature
• 1 kHz sensitivity: 108 dB SPL for a 0.14 volt input (105 dB @ 0.1 V; 107 dB @ 1mW)
• Impedance: 16 Ohms
• Maximum output: 120 dB SPL
• Maximum continuous input: 2.5 Vrms
• Weight: less than 1 oz.

What the press say

"For something that goes specifically where your mum told me not to put anything that's smaller than your elbow, they are a joy to wear - oh and the sound is terrific. Give them a week and you'll wonder how you ever did without them." - Birmingham Post