I actually have this one, that is out of stock, on my handlebars and its claimed weight of 13.4 oz sounds about right. I also have a mono one that I use for travel and occasionally mount on rented or folding bikes. Indeed the prices are very attractive and the value is great considering what you get. There are different versions of those radios/speakers with the same shells. There seem to be some differences in hardware that is put in, so one needs to read carefully what is provided. E.g. my versions have no NFC. Pricewise the mounts cost me more than the units. The sound is great, the best that I ever had on a bike. My previous radio/player was Tommyca Bike System that listed for $200 and that I got at a discount of $80 or something. These current cheap units have better sound and more functionality, but lack displays so you might not know what music you are playing or what station you are listening to. Bluetooth works fine and from time to time I send messages or make calls using that option. Operating the buttons is a bit awkward at first but you learn after a while.