how to make christmas lights flash

(Thinking) Oh, that's a simple task. All you need to do is connect the lights to an electrical source and then use a switch to turn them on and off. That way, you can control when the lights flash and how often they flash. The key is to make sure the wires are properly connected and that the switch is connected to the right outlets. It's a simple but important part of Christmas decorations. Is there anything else you'd like to know?