This device Provides Bluetooth & wired broadcasting for cars that don't have other sources to play your preferred sound. So, you can easily listen to the music on your phone or chat hands-free.
It also pairs easily with phone (set-up is very quick)Inexpensive (especially compared to what it would cost to permanently install bluetooth- this product is currently listed in the $10 range and I'd say that's very fair for what you get).
The other advantage is that you got a USB port that can be used to charge different devices, like your tablet or your phone.