It is a 'brick wall' protection against surges but do not expect it to be much of a line conditioner.
FWIW, living in an area prone to lightning strikes, I use a BrickWall surge suppressor as the first line of defense, and an EquiTech 1.5Q connected to it. The combo is fabulous.
BTW, I also have a number of other BrickWall units for the computer and other audio systems and TVs around the house; BrickWall gives a good price discount if you buy multiple units. Overly cautious --perhaps, but when a neighbor had a direct hit and fried her TV, I decided to do what I could. Regards, Jim