Grace Digital GDI-AQBLT300 Indoor/Outdoor Water Resistant Wireless Speakers with Dual Powered Transmitter Wireless transmitter & speakers 150-Feet range Speakers & transmitter work on AC or battery power Connects to stereo, TV, iPod or any MP3 player Expandable up to 10 additional accessory speakers 900 MHz wireless technology for up to 150' foot range to listen to your stereo, iPod, or TV outside in your yard or on your patio Dual powered (AC and batteries) stereo speakers and transmitter Control the volume via your audio source or directly on each speaker Includes blue mood lights with on/off switch on each speaker to enhance your listening pleasure Connect the family of Grace accessory speakers to the GDI-AQBLT300's main transmitter