Audio Unlimited's Wireless Floating Pool Speaker allows you to enjoy your music while relaxing in a hot tub, pool or any other water environment. This fully waterproof speaker is powered by 900MHz PLL circuitry, which guarantees a strong, clear signal up to 150FT away. The transmitter delivers a powerful signal through walls or any other obstacles in your yard. Just plug in your iPod, iPhone, computer, stereo, MP3 player or any device that has a 3.5mm or RCA output and enjoys high quality music without the hassle of running wires. Order one today and start your pool party on the perfect note. Transmitter is dual powered with optional battery power using 4 AA cell batteries (not included), or via UL Listed AC Power Adapter (included). Speaker is battery powered (using 6 AA cell alkaline batteries not included).