Nextar MA188 Car FM Transmitter/Charger for MP3 Players Compact FM transmitter/charger for listening to MP3 digital music in the car Wirelessly transmits audio to your car's stereo system via the FM airwaves 7 selectable FM frequencies: 87.7, 87.9, 88.1, 88.3, 88.5, 88.7, and 88.9 MHz Plugs into car's 12-volt cigarette lighter and USB player's USB jack Measures 3.46 x 1.38 x 0.9 inches (W x H x D); 90-day warranty