SOUNDFEEDER DIGITAL WIRELESS MUSIC ADAPT Wireless FM transmitter compatible with portable CD players, iPods, and MP3 players Plugs into audio device's headphone jack and transmits to empty FM frequency Supports 8 FM frequencies: 88.1, 88.3, 88.5, 88.7, 107.1, 107.3, 107.5, and 107.7 MHz Digital Phase Lock Loop circuitry eliminates electronic drift to ensure reliable sound Runs for up to 60 hours on 2 AA batteries; 2.25 by .88 by 3 inches (W x H x D)