These lights are perfect. I bought them to replace the battery pack lights I currently had. But I was going through 6 batteries a week with those. These lights not only have several different modes for all kinds of people's preferences (my fav is a slow shimmering mode), but it plugs into the wall via a USB connector. It does not, however, come with the charging box to plug your USB port into in order to use it in your outlet, so we used one of our phone charger boxes. It also has a battery pack on the lights so you could use it via batteries, say if you went camping with them like we do, or as a permanent fixture in your home where they stay plugged in. Your choice! It also comes with a remote, which works great for when we are camping and I click them on to get out of my "bed" to go outside in the middle of the night, lol.Will def be buying more of these plug in decorative string lights for my home and outside! Loved!