Shift3 Outdoor Speaker System Includes Multi-directional Wireless Speaker Unit, Wireless Transmitter, audio cable Receives wireless signal via transmitter for use with MP3 Players, CD Players, personal computers Powerful 10-meter range transmits through walls, floors and ceilings Speaker delivers 10 watts of rich, dynamic sound from twin 1.25-inch tweeters and one 4-inch It has a lightweight design with contoured carry handle for easy transport