30 amp surge protector

I've used the Surge Guardfor six years now, and it seems to have served me well. It has tripped on several occaisions and alerted me to voltage situtions and power spikes. I keep it plugged in at home as well. Our power blinks pretty often and since it automatically resets, I don't know how many times it detects spikes and lows, but while camping, it's pretty apparent. It does it's job as advertized.