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

Input:
Question: how to use BTR9 to transmit to an iphone
Document: This is a great little product - I have used it in transmit and receive mode - the sound quality into bluetooth Bose headset was great. Highly recommend - this adds a variety of capability to many receivers - you can transmit to headsets or receive signals from your smart phone and play your iphone music, Pandora  etc. All without having to upgrade your receiver
In this case I was pairing it to Creative WP-350 headphones which doesn't have a display, and nor does this device. I simply put the BTR9 into transmit mode, pressed the button for 5+ seconds for pairing mode (fast blinking on the LED), and then proceeded to just press the pair button on the headphones. It seems the headphones automatically understand what needs to happen and it just works. Cool. This would have 5 stars had I not had some frustration with the pairing.
I tried this as a transmitter on my ipod classic 160gb to a pair of plantronic backbeat 903 bluetooth headphones, The sound quality is decent, not quite as good as directly from my iphone 5s. The transmission distance is quite good, about 30 feet (two rooms away). The pairing is a difficult, it took 3-4 attempts as there is no visual selection process with which to choose the headset like there is on my iphone or on my hp tablet. The price is reasonable if the device holds up for a year of use.
Bought this particular one because it offered the flexibility of use as both a transmitter for using Bluetooth headphones from a non-Bluetooth source (In my particular case, our Home theatre sound system so I don't disturb my wife if she's trying to sleep.) or as a receiver for non-Bluetooth headphones or speakers from a Bluetooth capable source. (Ie my iPhone, iPad, or Android media players. )As long as I stay in line of sight and no more than 12-15 feet it offers good sound, and no drop outs.
The BTR9 Bluetooth Wireless Music Switchable Transmitter and Receiver is a great product. I usually use it to watch and listen to my DVD player from accross the room without disturbing anyone in the house. It works great and I would recommend it to anyone.
Trying to use the Indigo BTR9 with Plantronics Backbeat 903+. When I can get the unit to pair, then turn off the Plantronics and turn it back on later, the Indigo does not connect. The manufacturers web site www.miccastore.com is no help, it doesn't even show the device, as if it doesn't exist. Any suggestions?
all from my phone.Since the car turns off the power when I shut it off, the BTR9 would turn itself off after a little while of no use, so each time I got in my car, I'd need to press the button to turn it on (not a big deal). Unfortunately, it did get flaky sometimes, not wanting to pair with my phone unless I unplugged the USB charger - I couldn't figure out why sometimes it would work and sometimes it wouldn't, but this ultimately led to the problem with this unit and that others found as well.
You will NOT need to pair the device again after turning it on if already paired previously. Just use your phone to establish the connection from there.I've noticed that the audio lags behind the video anywhere between 150 to 300 milliseconds (0.15 to 0.30 seconds) and this can be easily adjusted in VLC or XBMC to sync up the audio and video. If you're using it with a broadcast TV and do not have the ability to offset the audio then this could be a little annoying.The range from BTR9 to BTR9 is decent, but not as good as between my laptop and the BTR9.
I bought this along with another receiver-only bluetooth device, the Mpow Streambot Mini Wireless Bluetooth 4.0 Audio Music Streaming Receiver Adapter. When I pair that receiver with my samsung tablet, I can go anywhere in the range (30 feet or so) and in other rooms with little disturbances. When I use this BTR9 device in transmitter mode, if i simply place my hand between the transmitter and receiver, it stops working.As a receiver, it works but has fewer features than my Mpow, and it cost 1/3 more.
It connected to my Samsung Galaxy S3 fairly seamlessly in my car. My car has bluetooth capability for the phone only, but also has a 1/8&#34; jack for external music input. What was nice is that I could keep this thing connected in my center console with USB power. On my phone, I set the car bluetooth for phone only, and the BTR9 set for media only, and it worked pretty much flawlessly, with my phone deciding which output to use. I was able to take calls, listen to music, hear the navigation, etc.
Answer: If I'm not mistaken you can't use it on the iPhone as a transmitter. You use it as a receiver. It will receive music from iPhone and send it to.....for example, your car stereo. If you have Bluetooth headphones or speakers you would use it as a transmitter for example I have an old mixer for DJing and it's not Bluetooth so I put the BTR9 in the jack where the headphones go......now it transmits the music to my headphones. To pair it to your iPhone just turn on the BTR9 then turn ur Bluetooth on on ur iPhone and it should find it. It took a couple of on and off before it read the signal but now that it's hook as soon as I turn on my iPhone or the BTR9 it automatically connects. Hope this was helpful and hope I didn't offend u in anyway by explaining more in depth.