Advent ADV-W801 900 MHz 2-Way Wireless Indoor/Outdoor Speaker, Green Wireless, 20-watt indoor/outdoor speaker with green, dome-like housing Blends easily into most garden environments; splash-proof housing resists water damage 5-inch woofer and 1-inch dome tweeter; includes volume control and frequency adjustment 900 MHz wireless transmitter broadcasts up to 150 feet, including through walls and floors Runs on AC adapter (included) or 8 D-cell batteries; 1-year warranty