This is an extremely high quality bicycle speaker with FM Radio. The speaker has a detachable McCarthy chain Guarana cable and is super easy to connect to your bike with either a helmetprovided headlight or your hands. The speaker also has a USB connector, so you can power it up with a standard USB cable. The speaker is great for using while you’re biking, on the run, or even in your car. This speaker is a must have for any cyclist!