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The Sennheiser MX 680i is a set of in-ear headphones designed in conjunction with adidas for an active lifestyle.

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Rubberized components provide effective sweat protection - controls and microphone are well-protected and can endure months of regular use

1 agrees

Various-sized "EarFin" components work very well - fits comfortably into the upper crevices of the ear to ensure safe, reliable performance

1 agrees

In-line microphone provides clear, high-quality audio - user's voice is reproduced in a balanced, highly-audible manner

1 agrees

Lifetime warranty ensures user satisfaction - unit can be easily replaced if accidental damage or malfunction occur

0 agrees
  • Only 3 words are allowed.

Remote peripheral is fairly underwhelming - buttons feel somewhat squishy and are without a confirmatory "click" sound or feel

1 agrees

Sond quality is fairly poor - minimal bass presence with harsh, tinny treble overtones

1 agrees

Not recommended for private listening applications - unit is designed specifically to let in ambient noise for increased safety during exercise

1 agrees

Single rubberized button control is very difficult to use, especially while exercising - distinguishing between buttons is even more difficult when wearing gloves or sweating excessively

1 agrees
  • Only 3 words are allowed.


The Sennheiser MX 680i is a set of in-ear headphones designed in conjunction with adidas for an active lifestyle. The EarFin holding system of these headphones helps to keep them in your ears during workouts. For workout durability, these headphones are sweat and water resistant. The most unique feature of these headphones is the fact that they come with an integrated mic and remote control, and are compatible with the iPod and iPhone. Music can be controlled with the remote control, and you can take iPhone calls with the mic. This model differs from the identically priced OMX 680i and PMX 680i models only in terms of style. While the MX 680i model has a simple in-ear design, the OMX 680i headphones go around the ear, and the PMX 680i headset goes all the way around the head.

  • Frequency response (headphones): 18 - 20,000 Hz
  • Total harmonic distortion:
  • Sound pressure level: (SPL) 118 dB
  • Impedance: 16 Ω
  • Jack plug: 3.5 mm, straight
  • Cable length: 1.2 m
  • Frequency response (microphone) 100 - 10,000 Hz
  • Omni-directional microphone
  • Microphone sensitivity: -44dBV/Pa
  • Weight: 14 grams  
  • 1 pair of foam ear pads
  • 2 pairs of ear sleeves(size S and L)
  • 2 pairs of air cushion adapters(size S and L)
  • 3 pairs of EarFins(size S, M and L)
  • 1 pair of housing rings
  • Cable clip
  • Storage pouch
  • Instruction manual
  • Water/sweat resistant
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