Outdoor Wireless Speaker and Dock. Weather-resistant design for outdoor or indoor use. Versatile dock connects to your stereo system or MP3 player, transmits music wirelessly to speaker. Dock transmits through walls, floors and ceilings to speaker from up to 150' away. Powerful 5" woofer and 1" tweeter deliver full, omnidirectional sound 3 channels prevent interference with other devices. Blue light for night use AC adapter (included) or 8 D batteries (not included) 9.2" x 8.4" x 16.8" (speaker), 1.6" x 5.48" x 4.84" (transmitter). This universal dock connects to any stereo or MP3 player, streaming your music through walls, floors or ceilings via a clear, strong 900MHz signal to the Outdoor Speaker. Runs on included AC adapter, or 6 AA batteries (not included