how to find master bulb out on christmas lights

The best way to find the master bulb on Christmas lights is to look for the plug with the most pins or prongs. This is usually the master plug and it should be the one that controls the power to the entire string of lights. If the lights are battery powered, then you can usually find a small switch or button on the side or back of the battery pack that will turn the lights on and off. Just be careful not to mix up the master plug with the other plugs in the strand as this could cause the lights to not work properly.