The call and sound quality of this product is reasonably good. Not much echo or static noise. Once it is turned on, my cell phone connects to it in just a second or two.Contraray to what others have said, I like the "giant" LED a lot. Finally some one has designed a LED that has HIGH CONTRAST colors(BLUD and RED) instead of the the "usual" yellow, green, and amber that I can't never make out the differences.The build-in battery can store a good amount of power for my hour long commute for a week or so.2 things I think it can be improved.First, the not-so-easy to feel power button needs to held for about 2~3 seconds in order to activate the system. This is obviously a design concept incorrectly and blindly copied from cell phones. This device does NOT need the power-on delay proection like a cell phone does.Second, it should be operated on-demand instead so that that we answer the phone AND turn the device on in the SAME push of a button. When we are done talking, we hang up and turn it off in another single push of button. There is really no need to keep the device on all the time(a complete waste of battery power). This is a typical flaw in the product design process where the focus is on the technology(Blue tooth) but not on the user practicality.