Technical Specifications Dimensions: 12.5 mm x 26 mm x 72 mm; total length including cable: 85 cm Weight: 0.6 oz. Antenna: Built-in Power: Provided by 12 Volt cigarette lighter/power outlet (no batteries required) Modulation: FM Stereo Frequencies: 87.9 - 107.9 MHz Oscillator: High stability crystal, phase-lock loop control Frequency Response: 50 Hz to 15 KHz Operating Range: 10 - 30 ft. FCC Compliance: PAV9501