Listen to music anywhere inside or outside your house without the hassle of running speaker wires! These high-quality, water-resistant speakers can even be used in wet areas outside your home. This pair of wireless accessory speakers (no transmitter included - must be used with the transmitter provided in the GDI-AQBLT300 or GDI-AQBLT300B) are powered by Phase Loop Lock 900MHz which automatically locks into either of two available channels providing a clear audio signal with range up to 150 feet with minimum line of sight limitations. The signal works like high end wireless cordless phones delivering a crystal clear signal through walls or any other obstacles in your yard. The speakers and system transmitter is both AC and Battery powered and supports various audio inputs including RCA inputs for home theatre receivers, MP3 players, computers and iPods, iPhones, Android phones etc. Grace Digital"s wireless speaker system is perfect for enjoying your music or extending your TV"s sound. Listen to all your music and never miss your favorite game whether in your home or outside around the pool/spa, on the patio, near the BBQ, in your office, garage, or out on the deck during those hot summer nights.