The ADV-W801 gives you the freedom to have your music anywhere you want. A 900 MHz transmitter sends a strong signal up to 150ft.* away with the ability to transmit through walls, floors and ceilings. The unique design and green color blend seamlessly in the garden allowing you to hide the weather-resistant** speaker from view while still hearing it loud and clear. The 20 watt speaker is a two-way acoustic suspension design with a 5” woofer and 1” dome tweeter. The speaker offers the ability to fine tune the frequency to remove possible interference that the speaker might receive. A L/R/mono switch allows the speaker to be used as either a single speaker in a stereo set or a mono speaker. Eight D-cell batteries power the W801 for true “wire-less” use or the supplied AC adapter can power it. *Transmission distance will vary depending on home construction. **Speaker is weather-resistant; it is not designed for continual use in wet locations.