I am selling this headset on eBay. Here is the link:
http://cgi.ebay.com/ws/eBayISAPI.dll...MESE%3AIT&rd=1

I am selling it because it didn't perform very well with my 700p. I don't know how it works with the 700w, 650 or other devices. Very low price and shipping! Auction ends on 6/29.