DESC: Features Transmitter connects to any stereo or MP3 player and sends audio through walls and floors to the wireless, wall-mountable speakers. 900MHz Digital Hybrid System with PLL (Phase Lock Loop) tuning ensures an interference-free audio signal.. Weatherproof housing permits outdoor placement of the speakers anywhere within 150 feet of the transmitter.. Includes wireless Remote Control Wireless remote for volume and tuning. Auto shutoff conserves power. Model: CT413 iPod not Included