The Schooner II Add-On Weatherproof Wireless Speakers from Grace Digital Audio are great for listening to music inside or outside your home without running speaker wires or power outlets! Connect to an existing Schooner II system including a two-channel transmitter (sold separately) for hours of great sounding audio. Grace's high-quality, weather-resistant speakers are perfect for wet or dry areas anywhere inside or outside your home. Each speaker is also equipped with a mood light for added night time party fun. Powered by 900MHz 2-channel Phase Loop Lock circuitry they automatically lock in and keep the audio signal strong and clear within a range of up to 150 feet. The transmitter (sold seperately) supports various audio inputs including RCA inputs for home theatre receivers, and headset connector for iPods, iPhone, TV's, MP3 players, and computers. Grace's wireless speaker system is a great solution for adding music inside and outside your home including: TV room for rear speakers, on the patio, near the pool, in your office, garage or garden. The speakers as well as the transmitter are dual powered. Both can play for hours of enjoyment on battery power or plug them into nearby AC power outlets. Enjoy your music without wires - with Grace.