Instruction: Given a question and its related document, determine if the question is answerable by analyzing the information in the document. Output yes if the document addresses the question, or no otherwise.

Input:
Question: Do I have to remove breaker panel cover or can I simply scan down switches?
Document: Several people complained about how this works. I don't have any problem if I follow the directions. Plug the transmitter into the outlet. Scan the entire panel box one time, then scan it again to indicate the appropriate breaker. I have only used it a couple times, but it worked perfectly in each instance.
With the power on, scan the rows of breakers from top to bottom (see Figure 3). During this scan, the RECEIVER may beep and flash at several breakers. This is a normal part of the identification process. When you have completed one scan of all the breakers, go back to the first breaker and, WITHOUT TOUCHING THE POWER BUTTON, SCAN THEM ALL A SECOND TIME. When the receiver beeps and the arrow flashes during the second scan, you have correctly identified the circuit.
This breaker tester is perfect for the job. And, the price can't be beat. Probably something you'll use one time to identify the switches in the box and, once that's done, the tester will go into your tool chest. It does exactly what it says it will do. One recommendation, run it a few times on the same circuit to be sure of the reading. I think that interference from someone using a plug in another room at exactly the time you test might throw it off.
Anytime it receives a signal of equal strength or stronger than any signal it has received since it was powered on, it beeps and flashes the arrow, and memorizes this new strongest signal strength. The initial scan over the circuit breakers is essentially calibrating the receiver, so that it then knows the strongest received signal strength.
I have used it on two separate occasions and it was not entirely accurate in pointing out the correct circuit breaker.
It is less accurate than I expected but it does help narrow down which outlet is on each breaker. Take the time to label well and you will not need to you it often.
I like this little gadget a lot. I've ended up using it to map out a circuit diagram of my entire house and two others. Most of the time, it signals *exactly at* the right breaker, but sometimes it signals between breakers, and you have to use some common sense.
this can locate a circuit breaker when it it on. This item cannot a locate a circuit breaker that is off or  off because it is faulty. So you need a device that can trace the wire by injecting a HF audio modulated signal which could be sensed by a probe. I would like to know if there is one of this kind.
Based on my experience with this product, I would speculate that any review claiming that the circuit breaker locator randomly beeps and doesn't properly indicate the correct circuit breaker is from someone who didn't read and follow the product's simple instructions. The instructions are included in a short instruction sheet, but are also printed on a nice indelible sticker on the receiver itself.
Step one is certainly to read the directions, which I did and the device has never missed finding the correct circuit-breaker. But, I cannot imagine what the designers were thinking when they designed the power switch. MIO, the unit should not be stored without removing the battery. And the battery compartment is secured with a screw. It is a cheap - cap with wires - battery connector, which has to be pried off.
Answer: yes