I have now owned two of these units and I must say they are good for the price.
It connects to my iTouch no problem, I do a 1 hour journey to and throw from work each day and this kit is easy to install inside your crash helmet. It comes with good quality sticky back velcrose pads for locating the speakers into place once this is done you are left with a female connector lead about 75mm long dangling from your crash helmet so you can connect the lead from your mp3 player into it once you have turnned it on and put it in your internal top pocket on your bike jacket.
There is a good length coiled lead for connecting to your mp3 player. The volume control has an easy use thumb wheel located near the speaker end of the lead, this means you can leave the volume control outside the top of your jacket where the zip ends so you can adjust the volume when your riding your bike.
The only thing is when you adjust the volume it can be a bit crackly after several months of use, but once you have found your volume level its ok. Also, because you are not plugging directly into your ears you can still be aware of the surrounding traffic noise etc.
I listen to rock music and the sound quality has enough bass and loudness to do the job well inside your crash helmet.
TIP: make sure you use a bit of blue tack to locate the speakers into place inside your crash helmet and play a test piece of music to check if they are lined up with your ears properly otherwise you will loose the sound quality if they are not over your ear holes!.!!!........
All in all for the money it's a good buy!.