EXCEPTIONALLY GREAT SOUND - High fidelity sound for small-to-medium outdoor areas; Atrium 4 can be installed in any open space – by a pool, on the patio, in the sunroom, or fit anywhere in the backyard ULTRA COMPACT - Compact outdoor loudspeaker with a 4.5” dynamic balance polypropylene woofer, ¾” anodized aluminum dome tweeter EASY SETUP - Polk’s gold plated 5-way biding post can easily connect to any modern AVR or amplifier EASY INSTALLATION - One-click speed-lock mounting bracket offers anti-slip, one-handed installation; Mount these speakers vertically or horizontally to deliver optimal sound in different setups ALL WEATHER CERTIFICATION - The speaker for all seasons; With rugged durability and premium build, these speakers can effortlessly withstand all elements including extreme temperatures and heavy rain