Be careful about what sort of mini-usb connector you have This is very cheap, but note that there are different sorts of mini-usb sockets (and you are not warned about this) - this is NOT a mini-B one (with two bevelled corners). Also, the returns policy means it will cost you far more to return it if it turns out to be wrong.
Aweful! Have received 2 of these (first was faulty so requested a replacement - which did turn up promptly), however the insulation has come away from the USB connection on both of these. Poorly manufactured. Will be trying one of the official HTC connectors
Finally I can use my own earphones on Touch Diamond First of all, there actually shouldn't be a need for this product. Touch Diamond should have a standard earphone plug on it. I mean the earphones they ship with the phone look cool and all but are useless (like most default earphones). Shame on you HTC. But to the actual product. It plugs in to the phone and then you can just plug in your own (good) earphones. Works perfectly, connections are tight. The cable in between seems a bit cheap, very flexibe and narrow (and wouldn't need to be that long).... more info
Fantastic. Excellent, I had to buy this cause the earphones that came with my HTC Touch aren't in ear ones and there so uncomforatble so I wanted to use my iPod ones. Very Fast delivery came in 2 days!