Instruction: Answer the given question using the supporting document.

Input:
Question: OK, just received mine..and how does the thing work..I don't understand the led light thing. I did test it on my wifi with the sound and got the hang
Document: I got this as a little amusement for myself and tried it on several cameras and other devices but I can tell you now that it just feels like the cheapest thing ever made. I wouldn't be surprised if it was never actually designed to work but to just trick bored people into buying something that lights up. Do not buy.
This does find RF signal sources and the LED's generate light that reflects cameras. It is not perfect by any means and you will have to adjust the sensitivity several times as you check your surroundings, but I used it to find the RF from some WiFi cameras, a WiFi router in a ceiling, some cameras using the light reflectancy, cell phone, and some other items.
Freaking amazing price for this. It is very lightweight and feels like china, but it works if you can get the hang of adjusting the sensitivity. Fun to scan party guests before they come in :)I have been in spy shops that sell the EXACT same thing for $89.00
The Red LED's work the same as others. I've tested mine with mini pinhole camera's on keychains, pens, and others that don't have an RF signal. Being limited to the range of common wireless cameras, GPS, electronic bugs, etc. has eliminated all the falsing issues with alerts on common appliances or radios.The only drawback to these is when using the LED's to locate a camera. The bright Red Light emitted draws attention from curious bystanders.
Price is affordable , little tricky for 1st time use it but after a while playing with it you got to use it. Pay special attention on the vibrate and sound button it seem you have to soft touch it to get it to works. Over all you got what you pay for and it works that's what it important right. I tried with my wireless router and wireless camera and making the right noise and vibration.
This is a great gadget for detecting microwave transmitter/receivers from a cell phone, notebok with WiFi, a Wireless Modem or ? I bought this to make sure my room isn't being bugged, or my car dosn't have a hidden GPS tag. Yes I'm kind of paranoid, but you havn't lived my life. It's coated in gelskin, and has an audible or silent setting. It has earbuds and has an infrared light to detect hidden cameras. This works on the principle that glass reflects the light back to you.
She has no clue how to use use it and she is afraid of getting caught in the act, though she is the victim, so I only was able to test it on my own video surveillance equipment and it did in fact work very well in spotting my cams, though they are in plain sight.
While the product might work, I can't even use it because I cannot understand the directions. I think it was translated word for word from a foreign language which results in sentences that make no sense at all. Anyone know how to use this?
I checked my microwave and plenty of waves seem to be coming out of a couple corners,  I checked my sister's microwave and waves are being detected from everywhere in front of hers. I think her microwave may be giving off radio waves because it doesn't make sense that her microwave would be that defected. Anyway, this thing seems to work.
Same with other random signals I came across. Certain electrical outlets it registers nothing. Some of the ones which have the test/reset buttons on them, it would register. One of them to tried it near, it did not.
Answer: The LED light thing is to detect CAMERA LENSES.  You turn it on and slowly pan the room while looking through the red hole.  The LED lights shine light outwards and then the light bounces off the offending camera, making it visible.  To see what it should look like, use your web cam or camera phone as an example.  I hope this helps.