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: It works when i plug to wall outlet. However when I tried to use in in my car using 75w power inverter but it doesnt work. any one knows why?
Document: This works great for those traveling and does not have a coffee pot. We use it to heat the water and then add instant coffee.
This item worked great the few times I used it before accidentally setting it down on a plastic bag. The melted plastic shorted it out and it quit working. Before using, plan where you're going to put it down after your water has heated up. It works very fast and my water actually came to a boil.
As I am using this product only in Europe I have had no problems with the time taken to boil water - this heater works very well and is the perfect product for me. Like the fact that it also comes with its own electrical adapter as well. I would definitely purchase this product again.
I needed a way to heat up coffee at work. This works great. I would recommend it to anyone else who can't have a microwave in their space at work.
Do not purchase this heater, it stopped working on it's third use. When it did work it took a long time to heat water. I should have sent it back after the first use. I can guarantee that it was never removed from the cup while still plugged in. Luckily my friend brought his that he purchased a couple of years ago that heated water twice as fast and has been used a lot. We both used it for the rest of our trip without any problem.
I ordered this heater for my parents who were taking a 6 week trip to Europe. My mum LOVED it! None of the hotels she stayed in had a jug to heat water so she used it almost daily. It lasted her the whole trip for heating water for tea in the morning. It heated water super quick and it's tiny and easy to carry and comes with a neat wee drawstring bag to carry it in. She's still using it at work to heat her water for tea in the office.
I love this item. I use it almost everyday heating water for coffee. It's safe to use. Highly recommended .thank you
Best Unit I've tried. Heats the water, in 4 or 5 minutes!! !I burned it up by not having it emerged in water....
This is an excellent unit - we originally purchased a 120/220 volt unit and it took about 40 minutes to heat water using 120v. I am sure it would heat much faster using 220v. This is a 120v only and heats water in less than 2 minutes.
I purchased this product and brought it to Europe with me. It works perfectly and only takes about 2 minutes or possibly less to heat a cup of water so that it is boiling.
Answer: no