Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: Does it transmit picture and sound or just the picture? can i use it to play a movie on the mac and watch it on TV?
Document: If your computer came with a Mini Display Port or Thunderbolt port but no HDMI port, this very low-cost and compact adapter will let you use any TV, monitor, or projector with an HDMI port to share your display. I found it to be plug-and-play. This device supports transmission of audio, but some older computers may not support it. For example, Macs built before 2010 don't support sound transmission through their Mini Display Port outputs.
Not much more to say about this cable except that it works great! It provides fantastic picture quality. We &#34;cut the cord&#34; recently, and so have been missing some of the TV shows that we would normally watch, because they aren't available on any kind of player like Roku. BUT, some of what we've been missing can be streamed online using a computer.
Works like a charm and less than half the price of the one Apple sells. I use it with my MacBook Air to watch my netflix shows on the TV. I recommend this item for sure!
Sometimes I want to use my Macbook Air on a big screen - showing photos at a party, playing a video, doing taxes where I need to see the whole screen.This thing connects to HDMI monitors or the HDMI input on a TV just fine - make sure you have an HDMI cable for the connections, and make sure that your Mac has a MiniDisplay port.
I had my doubts when I bought this product, but it totally worth the price, now I can use my LEDTV to watch anything I want
This works most of the time, but sometimes will crash my Macbook Pro if I try to use it while it's running. Believe that this could be a Mac related issue and not related to the adapter, but wanted to document.
Pixelated images even after adjusting screen resolution. I tried this on my iMac via Mini DisplayPort (Thunderbolt) and plugged in via HDMI to a monitor and experienced a washed out picture with pixelation at any resolution I set the other monitor to. I even tried to use my MacBook Pro and experienced the same issue when plugging in an external monitor. This is the first AmazonBasics product I have been dissatisfied with.
Worked well for MacBook Pro late 2010. Plug adapter into Mac mini display port. Plug in standard HDMI cable between adapter and TV. Voila!
This is a great product at an even better price. I have a macbook Pro and since we don't have a dvd player in our bedroom, I simply insert the dvd in my Pro, connect the adapter in it and put the end of the HDMI cable coming from the TV. It works great, the picture quality is wonderful and the audio is passed by going into your Sounds section and transferring it to the TV. Love it!
This mini DisplayPort to HDMI adapter lets you connect certain recent Mac models (from 2008 and up) to HDMI displays to provide mirroring or desktop extension.I used it to connect my 2008 MacBook Pro to a Panasonic 60" plasma TV.
Answer: Macs built before 2010 don't support sound transmission through their Mini Display Port outputs. However, the cable itself does transmit sound if your computer supports it.