... all the lights by this key.8. Up to 4 lights to be linked up in one panel, with one, ... will find it no need to turn on lights by going from one switch to another, when you feel tired ... or turn off for you to take a nap. Advantage:1. Touching panel is weak electricity,much more safer.2. LED ... , lights will dim down or turn off for you to take a nap. Technical data: voltage100-240V AC50/60HzMaximum Load4A ...