car latest bluetooth universal kit fm wireless audio receiver transmitter mp3 player hands usb charger modulator broadcast

this product is dual usb output. you can charge two devices at the same time ,the maximu output is 5v / 2a. insert u disk ,only the one usb port(the number 10) support. line and insert u disk and bluetooth turned on, then boot priority bluetooth connection; when the bluetooth connection on and then insert u disk / line, the latter takes precedence. when the machine in fm transmitter ,volume will not be too much (generally 25 or less position) in order to avoid sound distortion, adjust the volume using the car stereo adjustments.