These are acclaimed dual driver in-ear monitors. You can go www.westone.com to find out more..
from westone:
Quote:
Built to the highest professional standards, the dual balanced armature driver UM2 provides amazing low frequency response and rich, articulate mids and highs. Using the same technology as our custom ES2, the UM2 is the earpiece of choice for performers desiring high-end Westone sound quality at an affordable price. The comfortable Comply™ foam tips allow for extended use without fatigue. Providing up to 25 dB of ambient noise reduction, the UM2 is the perfect choice for on-stage performing or for personal listening. Equipped with a durable 50" stereo "Y" cord and a 3.5mm stereo jack, the UM2 is also perfect for personal audio devices such as MP3s, CD players, and laptop computers. www.goodgearguide.com.au - "As far as rich, fun IEMs go, you cannot go past the Westone UM2"
Save 60 dollars for a brand new UM2 which comes with the standard original packaging, carrying case, ear wax loop to clean out the monitors, 4 pairs of comply tips, and the warranty card to extend to 2 years warranty(valid direct with Westone)
Easiest would be to email me at hann@happyeveryday.org or 98300978 and I'll be happy to give you more details.