My husband and I have two of these now and are very satisfied with them. We bought the second one because we were happy with the first one. They are great for parties when our guests are both indoors and outdoors. Farthest we've tried them is about 100 feet from the house, and they work fine. We use the provided power supply and have had no problem. They don't sound like a high-end speaker, but they are adequate. We recommend them to our guests that are surprised at how well they work outside.