These lights will drive you crazy. They have multiple settings with the default setting an obnoxious flashing sequence. You can hold the button until it turns green and the built in timer will keep it on your preferred setting. However, I'm using my own timers because I prefer to keep my lights on longer than the built in timer allows. When the cord loses power (or my timer kicks off), they will default back to the obnoxious flashing sequence when they kick back on. I'm buying different controllers to try but so far no luck - the one I tried keeps them steady, but every other lightbulb then doesn't work... Which is still better than the flashing sequence... What a ridiculous design...