Like all of our outdoor models, the Atrium 5 are All-Weather Certified and Water-Resistant-built to withstand the worst elements-salt-fog, UV, extreme temps or heavy rains, you name it. Youll be enjoying great performance for years to come. Its time to get that indoor sound you love-all from an outdoor loudspeaker you can put anywhere around your home. Aluminum grilles and bracket, with stainless steel and brass hardware means no rust-ever. Features Polks patented Dynamic Balance technology with 5″ Driver and 0.75″ Tweeter. Power Port Technology smoothly transitions air flow from the speaker into your listening area for deep, extended bass impact while minimizing turbulence and distortion. These speakers are easy to install and look great both outdoors and indoors.