Using these Defender E89817 festoon string lights is easy. First, decide where you want to install them. Use the built - in mounting points to secure the lights in place. If you're using the 110V version, make sure it's for on - site use, and the 240V version is for home use only. When you turn them on, you'll enjoy a bright, glare - free light. As for maintenance, since they are heat - free and glass - free, you don't have to worry about high temperatures or broken glass. Just check the sealed modules occasionally to make sure they are still intact. If you notice any dust or dirt on the diffused lens, you can gently wipe it clean with a soft cloth. That's all there is to it to keep these lights shining bright for a long time.