Parmak, electro-gard lightning/surge protector. Protect your 110-120 volt a.c. operated electric fencer from lightning and power surge damage. Also protect computers, tv's and other sensitive solid state equipment. Today's delicate electronic equipment does need this protection. Just plug electro-gard into any 110-120 volt a.c. outlet. operational light indicates electro-gard is on the job. Limits high voltage spikes to 350 volts and can absorb up to 34 watts of transient power.