It has several programs that blink like Christmas lights, some slower and some faster. In my opinion, since they are fireflies, it should only have the slow one and a steady one - which is not available at all. You should keep in mind that it requires direct sunlight to work. On a terrace that does not get direct sunlight, it did not work for me. A few hours of exposure to the sun are enough for about 3-4 hours of lighting, but it definitely needs direct exposure. I didn't like that the on/off switch is a single-position (button) and therefore you don't know when it is on and when it is not during the day. If the switch is left in the on position, then the lights turn on every day when the sensor detects that it has gotten dark. I have them in an outdoor area that is exposed to rain and they haven't been damaged so far.