Podfreq Mini Fmtransmitter/dock for Ipod Mini Only Compatible with any iPod mini with a dock connector Antenna Telescoping - 8.6 inches (21.8 cm) when fully extended Power Requirement - No batteries or power cables; powered by the iPod Tuning Type - Digital tuning, tunes in 0.1 MHz steps, last station recall Auto Level Control - Built-in to prevent sound distortion