Listen to music just about anywhere without the hassle of running speaker wire. These high-quality, weather-resistant speakers can even be used in wet areas. Powered by 900MHz Phase Loop Lock circuitry which automatically locks in and keeps the audio signal clear and strong within a range of up to 150 feet. with no line of sight limitations. The signal works just like high powered wireless 900MHz phones delivering a crystal clear signal through walls or any other obstacles in your yard truly offering endless installation options.The system transmitter supports all types audio inputs including RCA inputs for home theater receivers, MP3 players, computers, iPods, iPhones, and iPads. Audio Unlimited's wireless speaker system is the perfect solution for adding music around the pool/spa, on the patio, near the BBQ, in your office, garage, in the garden, or out on the deck during those hot summer nights.