Warm White Christmas Lights AC100V Power Supply Rainproof Type, 400 Bulbs Can be used indoors or outdoors. These are the incandescent bulb type Christmas lights, which are becoming less common these days. Unlike LEDs, they give off a warm feeling. Power tested, but since the test was done while the lights were still wound up, there may be some bulbs that don't light up. This is a used item that has been stored at home for a long time, so it is not recommended for those seeking a perfect product or those who are concerned about the condition. We cannot provide support for any malfunctions after purchase. Please be sure to inquire in the comments before purchasing if you have any questions. Please purchase only if you understand and agree. Instant purchase is welcome.