The Pyle PDWR52 mountable speaker systems provide high-powered wireless Bluetooth performance indoors or out! Featuring rugged marine grade waterproof construction, they are the perfect choice for adding full range stereo sound on boats, decks, patios or backyards. The system includes (2) speakers one active and one passive, along with a built-in digital amplifier. Once connected, the polymer dome tweeters create crisp high frequency sound and the fortified long-throw woofers generate some impressive bass. Built-in Bluetooth audio streaming ability allows you to connect and stream audio from all of your favourite devices, quickly and easily (works with iPhones, Androids, Smartphones, Tablets, Laptops, Computers, etc.). You will also have the ability to connect additional external devices.