I used the ON / OFF button to turn off the devices connected to this block. After 2 or 3 months, the switch is set to make sparks and then not work at all. I activated the warranty and I got the same replacement model. Even everyday use of the switch, and even result after 2 months: sparks and stop functioning. I conclude that this is a design flaw, not bad luck. The switch is not made to be used!