The Wireless Fm transmitter allows you to stream audio from your phone to old-school car stereo systems. Now, the purist in your family can keep original equipment intact and still enjoy modern audio technology. If that s not reason enough, this bad boy also charges up to 3 devices at once, featuring rapid and dependable Power Delivery. Ever notice that traditional Usb chargers aren t powerful enough to charge your laptop? Power Delivery can do that. Yep, this thing streams hi-def audio And charges devices quicker and more efficiently than basic chargers.