The Pyle PDWR51 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 favorite devices, quickly and easily (works with iPhones, Androids, Smartphones, Tablets, Laptops, Computers, etc.). You will also have the ability to connect additional external devices to your speaker system thanks to the gold-plated speaker binding post plugs. Excellent for monitor or surround sound applications -- rain or shine! Add instant wireless streaming ability and high-powered waterproof audio performance with the Pyle PDWR51 indoor/outdoor speaker systems.