I purchased these to use outside on my deck and have been very impressed with them so far. They are very colorful and bright, and can be used either inside or outside. They are waterproof and use batteries, so I was easily able to string them without being concerned that I would need to find a plug in, or that rain would damage them. They have multiple modes that can be used, including flashing and sequential, and can be touched without fear of getting burnt. They produce just enough light for a festive glow and are perfect for a get together or to use for the holidays.