OSD Audio 8-Inch Wireless Bluetooth Single Stereo Outdoor Rock Speaker - Slate. BTR-800TT-SLATE. Outdoor Speakers. Enjoy rich, dynamic sound on your patio or in your pool area with all-weather patio speakers from OSD Audio. The pair of outdoor rock speakers are an excellent choice for hiding in gardens or landscaping. With state of the art Bluetooth 3. 0 technology, you can connect to any Bluetooth enabled device within 120 to 150 feet (direct line of sight) and enjoy music anywhere. These slate outdoor rock speakers include 8-inch dual polypropylene woofers and two, 2-inch dome tweeters to cover those high notes. The 2-way speakers crank out excellent low frequency and have handling power up to 80 Watts. All outdoor speakers from OSD Audio withstand water, rain, sun, and snow. It is made from materials that do not absorb water so it will not freeze and crack. The 2-way speakers include an AC Power supply, an 8-foot power cord that connects to the main speaker, but the speakers can also be powered by 6 AA batteries (not included).