Kensington FM Transmitter/Auto Charger for iPod (White) Combination FM transmitter/car charger for all iPods with dock connectors Red and green LED indicators signal the transmitting and charging states Phase-lock-loop technology easily connects with 1 of 8 channel options Aerielle and ClearFM technologies reduce noise and improve stereo separation 15-foot outside-the-car wireless range; 5-year warranty