What is the purpose of the usb connector and cable?

Questions & Answers: Universal In-Car Wireless FM Transmitter, Stream Music for Car Stereo System, Smartphone, iPad/iPod, Tablet PCs, MP3/MP4 and Hands Free Talking

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Universal In-Car Wireless FM Transmitter, Stream Music for Car Stereo System, Smartphone, iPad/iPod, Tablet PCs, MP3/MP4 and Hands Free Talking

FM transmitter for iPod / iPhone 3G / iPhone4 / and other MP3/4 Players,mobile phones with 3.5mm audio jack.
Handsfree talk function after you more safety during driving
LCD

Out of Stock