Audio Unlimited"s 900MHz Sandstone Wireless Weather Resistant Rock Speaker System (1 Standstone Wireless Rock Speakers and a Dual Power Transmitter) is the perfect system for today"s consumer who is looking to add to, or expand, high quality music and home theater sound taking it anywhere outside. With an imitation stone design you can enjoy the freedom of listening to music outdoors in your yard or garden without the hassle of running speaker wire.. 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, and iPhones.