X2 MEGA DJ FM Transmitter/USB Charger Transmit any audio stream to a car radio, stereo system or boom box with FM 4 FM Frequencies to choose from (89.1, 89.3, 89.5 and 89.7MHz) Powered by included 12V car charger or USB host power Car Charger also charges a USB powered MP3 player Plugs into any standard 2.5mm headphone jack