Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: Just to be sure, this devise connects to my smartphone through Bluetooth, and transmits my media through FM to my car stereo via my FM antenna
Document: I am astonished at how great this product is. Sure - you can buy a bluetooth car stereo for next to nothing, but if like me you have a car you love with steering wheel controls that you don't want to give up then the only option is some form of FM transmitter. I've tried LOTS and this is the first time I've seen someone smart enough to build a product that goes inline between the antenna and the head.
As soon as sound comes through again, it will switch back to sending your bluetooth audio source over FM. It really doesn't matter what frequency you choose since it temporarily connects itself instead of your vehicle's antenna to your radio when it's being used so there's no interference from existing stations.
Before my car stereo could automatically pick up even weak stations now I have to manually find and save them, this could be down to the fakra adaptors I had to buy for my car.The other downside is that if you also pair your phone to a handsfree kit (the iSimple only supports media) for phone calls the order in which you pair them is a bit fiddly. I had to unpair my handsfree kit, pair the iSimple set it up for bluetooth media then re-pair my handsfree kit.
This is not the cheapest Bluetooth --> FM device you can buy for your car/truck, but it is the most invisible and perhaps the most durable and effective device you'll find. It only plays the audio media content from your phone/tablet/etc (e.g. music, movie audio or podcasts, etc) but it does that very well.
Great, cost effective device to wirelessly stream music from your phone to your car stereo. It was very simple to install if you know what you're doing and how to locate switched power and ground. I wish there was the option to buy this without the FM antenna wires.
I liked this transmitter because it's so easy to turn your 'old' FM radio into a Bluetooth compliant car stereo. It does loose a little bit of quality on the air, I guess due it's not a native Bluetooth device, but it definitely does the trick.I would just love if it had a connect button so you don't have to turn it off and then on to connect to your device.BTW. It's iPhone 5 100% compatible.
Bought this to connect an iPhone to older vehicle via bluetooth. The manufacturer also sells an iPhone specific version that appeared to be the same thing at much higher price and their technical services confirmed that bluetooth is bluetooth. Works fine, only difficulty was obtaining the right antenna adapters for the vehicle.
it's a great product. Just make sure that the Bluetooth is turned on on your phone before you get in your car and start it. that was a little bit annoying to figure out at first, but once you understand that it works 100 percent of the time. No wires,great sound!
Installed in my 2005 Cadillac SRX with factory Bose stereo. Sounds pretty good, as good as any FM station. Easy to install with inline splices. Had to get antenna adapters for it to work. Had to get power from a wire in the ignition harness which was a little harder than the ground from the stereo, but not too tough. Only downside is it turns off when receiving phone calls or when the ignition turns off (although stereo stays on until door opens.)
I'm even able to use a free app called NFC Launcher to automatically launch Spotify when my new in-car Bluetooth connects. Next I plan on using an app like Tasker to automatically save the location of my car when I disconnect from the Bluetooth.Audio quality is great and made better by using the EQ on my phone.My 2006 Saturn now has more modern features than some of today's cars. Love it!
Answer: Correct, but it can also transmit audio through rca inputs if your stereo has them. FM is one of two options.