FEATURES Wirelessly Transmits Music from Any Audio Devices to FM Radio Ideal for MP3, CD, MD Playback 4 FM Frequency settings 3.5mm Stereo Audio Input Jack for Most Audio Devices Requires 2 X AAA Batteries (Not Included) SPECIFICATIONS: Unit Dimensions: 3.25" x 1.63" x 0.9" (WHD) Blister Dimensions: 5.75" x 9" x 1.3" (WHD)