I gave this purchase 5 stars, as I am a satisfied customer. EDIT: 3 months in on my second replacement, the right button decides when it wants to register or not. This unit operates on the 2. I love that its adjustable and it truly couldnt have been more perfect. Cosa non banale per un dispositivo che contiene dei nostri dati è la possibilità di inserire un blocco della band una volta che viene tolta dal polso. Parts of it are metal. It was a pain to put together, and Im usually pretty competent with furniture assembly. If you are a petite female like me, you might find it a bit difficult to put this product together, simply because the parts fit rather tightly. Bose sound systems always perform well, thats a given, although they tend to be a little on the expensive side. The mute slider and volume sliders are very handy.