"GREAT SOUND! - Quite comfortable - Good protection from wave aberrations - Range (about 7m - infrared) Summary: This infrared system by Sennheiser has been around for quite a long time now but it seems that there is little information nor opinion even on it's manufacturers site..."
"I think it might be due to the fact, that this model is no longer in retail sale..."
"These are relatively inexpensive..."
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Amazon.com: sennheiser mx450
12 pairs of Ear Foam Pads Covers for ipods MP3 Earbuds Earphones (Black) by Digole Digital Solutions...
Sennheiser MX 400 Headphones | eBay
Sennheiser: Model: MX 400: MPN: 004853: Features: Fit Design: In-Ear only: Earpiece Design: ... Sennheiser PXC 450 Noise Cancelling Headphones; About eBay; Community ...