I was surprised when I opened the box and found that the connector was a USB connector. Not sure why an adapter wasn't included or why they used a USB port. My DIL thinks it might be because it can be sold in other countries and you can use any adapter you need. So you need some kind of adapter to connect it. For example a battery or charger for a computer or a phone to connect it. The power button is on the top and is activated by touch. In operation it is very quiet. I think you will get more information from the box than from the instructions. Instructions see picture. Something is lost when translating from Chinese to English. Directions are very confusing.1. Connected to it some adapters. Anything you can plug into a USB connection.2. Open the bottom of the zapper (btw, zapper is a misnomer, it doesn't destroy anything) and this is where you'll use the tiny container (I'm assuming it's an insect attractor) that's in one of the 5 packages that come with the zapper come. (See the picture) You don't need to open the whole container, just peel off the Chinese paper seal, put it on the bottom of the zapper and close it.3. Be sure to place it on a table or something similar about a meter or about 3 feet off the ground so it can sit off the ground.4. Turn it on and let it run to catch the bugs. I love the fact that it can be used indoors or out. I plan to use it when we set up camp. I put this zipper on the outside but as it's the end of winter and we don't have any mosquitoes or bugs at this time of year. He caught a moth. But it didn't kill. Not sure if I just had to leave it in the container and the fan would take care of destroying the moth since like I said it's not a spark gap.
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