Always read and follow the manufacturer's instructions carefully. Pay particular attention to the "intended use" for the lights you are about to use.
Never use indoor lights outside.
Never insert or remove bulbs when the power is switched on.
For indoor or outdoor low-voltage lights, always keep the transformer indoors in a safe, dry location.
We would strongly recommend a safety cut-out device or circuit breaker to be used on all holiday lights.
Consider carefully the positioning of lights, remembering that some holiday lights generate a considerable amount of heat. Always keep lights clear of decorations and other flammable materials. Remember, even on low-voltage sets, the bulbs can become hot and the transformers can generate heat.
Carefully position cables to avoid a tripping hazard.
Do not leave the lights on unattended. Always switch them off when you go to bed and also when you are out of the house.
Do not attempt to use or repair any holiday lights which have become damaged. Dispose of them safely.
Do not attempt to modify the wiring on any product in any way.
Do not run wiring or cords under carpets -- carpets may be walked upon and the cords damaged.
Take care when hanging lights that you use a stable method of support.
Do not allow children to play with holiday lights.
Replace sets of old lights, especially those that are not in perfect working condition.