Kensington LiquidFM Plus for MP3 Players FM Transmitter ClearFM technology delivers superior sound QuickSeek technology finds the clearest station in seconds USB Pass-through charges your MP3 player or any USB powered device (cable sold separately) 3.5-mm adapter for all MP3 players; 2.5-mm adapter for MP3 cell phones; Compatible with iPod Shuffle; Nano (Gen 1,2,3); iPod (Gen 1,2,3,4); iPod Classic On/Off switch avoids car battery drain