General Spec Brand Black Horns Color white Input 12V Output USB5V/ 500mA Function   Charge your device in the car FM transmits the music from your iPhone/ iPod to car speaker Compatibility iPhone/ iPod Other FM transmitter Features You can keep your device fully charged while you drive. Compact design for easy storage. Will not backflow and overcharge. FM transmits the music from your iPhone/ iPod to car speaker. Frequencies: 88.1, 88.5, 88.7. Work directly with iPhone and iPod. Adjustable back buckle, compatible with iPhone/ iPod as well as most types of mobiles perfectly. Additional one USB port for charging other devices besides iPhone/ iPod.