Instruction: Generate an answer to the question by utilizing the information contained in the document.

Input:
Question: Does this camera have a built in microphone?
Document: The one I got does have the built-in microphone. The microphone is at the far end of the cable though (closer to the connector than the camera). This isn't convenient if you want to have the microphone exposed in the room but want to hide most of the cabling. I wish it was either embedded in the camera housing, or at least closer to the camera on the cable.
I am impressed with the brightness and distance the IR LEDs provide at night. A great additional feature of this camera is the built-in microphone. Important info which might be of importance to you is the video output connector of this camera are RCA instead of the typical BNC most surveillance cameras use. Not a big deal if you need a BNC/RCA adapter as they are available here on Amazon for just over $1/ea with free shipping.
Nice camera for any video system. Night vision works well as daytime imaging. well built camera just sitting on the post watching everybody
Granted, this is the first video security camera I have owned, but I was very pleased with this purchase. Our purpose for buying was to use it as a baby monitor. The combination microphone, IR night vision, and full color (though the colors are a little off) visible light, and price ($25!) was a perfect combination for our purposes. It provides a secure and interference free (not to mention cheap) option to the wireless systems.
Camera is listed for outdoors but the microphone is in the cable, outdoor use will destroy the mic in rain etc.Despite the stated 36 LEDs, the view area is only 30ft with point of focus less then 10 feet. Color balance is wrong and can not adjust, trees look blue on monitor instead of green in broad sunny day, my other camera is showing correct colors. I wanted to replace the camera to add audio.
Good enough to use for recording DVR for outdoor or indoor security purposes or even recording outside through a window. It's very small, has a built-in sunshade, 30 IR Illuminators for night time illumination, Easy to use mounting and adjusting too! You can get 50, 100 & 150 feet cables for this camera and the cables, power supply and camera all cost under $40 with free shipping.
The focus is tight (40 degree field of view, which is pretty standard for non wide angle units) and the two I received do have microphones. The night vision is ok with the built in illumination. But as has been said the plastic housing and base are flimsy and it is hard to lock them down with any sort of precision aiming. They will work fine for my needs.
the nite vision work well, and i like the color of the camera is nice. also the focus is very clear
When I bought this camera it didn't come with a cable or a power adapter. But purchasing seperately is very inexpensive anyways.
Overall this camera is a bargain at under $30 - we'll see how they last through the colder months and how long the IRs last.
Answer: Ignore my previous response. I may have misspoke on this camera, because I did not see anything in the write up about audio.  The camera I purchased had a microphone built into the camera wiring cable for audio.