GoXT Direct Plug Bluetooth/FM transmitter, transmit or play music or audio files wirelessly, makes older vehicles instantly compatible with any Bluetooth device such as iPods, iPads and smartphone, simply plug the transmitter into your 12V-24V socket and press and hold top power button, flashing lights indicate you can now sync your device through Bluetooth, adjust FM channel with arrow buttons on transmitter and ready to go, transmitter has two USB ports available, the left port for quick charging mobile devices and the right port for inserting USB flash drives up to 32GB.