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

Input:
Question: What is the Audio & video Range
Document: Product was delivered as promised but the instructions are sparse and confusing. It does work but the audio isn't as clear as I expected.
I love this door phone. It works great. I took it into the restroom turn off all lights and the video was clear. As far as the camera I left my unit plugged in and it is working great.
The doorbell and video work great. The intercom is terrible. You can't hear anything unless you are 2 or 3 inches from the speaker and that is not understandable. I'm keeping it because when the doorbell rings I am able to see the person outside before opening the front door.
can not pair the camera with the receiving units for more than a few minutes. also, camera battery only lasts 2 days on standby, not two weeks or months. I asked for a full refund but was ignored!~ I would NOT recommend this vendor
We bought this camera system a while ago but were not able to install it until our new home was recently finished. It has no name, shoddy installation instructions, no help number to call and doesn't work. Sound and camera lights don&#8217;t work. I finally contacted the seller (TTT-MALL) through Amazon but they only offered a $15 refund and would not offer replacement or refund. This vendor is obviously not in this country.
The camera and display work well enough but the battery in the camera only lasts about 5 days before completely discharging. After you have the camera mounted, it is difficult to remove it from the bracket it mounts in. It has to be removed from the mount to recharge the battery as the plug-in charger plugs into the back of the camera. They should have made it so you could plug in the charger without removing it from the mounting bracket.
Order was not complete. Extremely dissatisfied.
Not sure how this works in a house, but my company purchased two of these, and they are nothing short of crap. The picture quality is good, and you get several tones, but the wireless signal is simply non-existent. They worked 30% of the time. Had to return and spend more money on something better. Don't waste your time.
I was able to buy this product from another Web-site a little cheaper, but I buy a lot from Amazon and wanted everyone who buys from Amazon to know this product is well worth it price.
Best device EVER. We can be in the theatre room of our home where we normally do not hear the doorbell above the surround sound yet this device rings loudly, is portable and we can see who it is. Easy to install - absolutely NO complaints
Answer: 300 meters and I installed one video on the kitchen, close to the  main unit and the other one on my room with some walls ahead of the monitor and worked fine