Includes: (2) Polk Audio Atrium 8 Indoor Outdoor Speaker (Black) Two 1" Aluminum Dome Tweeters, 6.5" Dynamic Balance Woofer All-weather indoor/outdoor speaker with selectable stereo input mode Dual Tweeter placement is designed for better stereo separation Sensitivity 91 dB, Frequency response 45-27,000 Hz Impedance: 8-ohm stereo (dual-input) or 4-ohm mono (single-input) Handles up to 125 watts per channel Includes mounting hardware Dimensions: 8-1/2"W x 12-7/8"H x 9-7/16"D Install in any large or open space—by a pool, in the patio, the sunroom, halls or office areas - to deliver EXCEPTIONALLY GREAT SOUND. POWERPORT TECHNOLOGY directs the airflow downwards so you hear a REALISTIC SOUND SEEMINGLY CLOSE TO YOU One-click SPEED-LOCK MOUNTING BRACKET offers EASY, ANTI-SLIP ONE-HANDED INSTALLATION - mount speakers vertically or horizontally, to deliver the best sound. Simply mount the swiveling C-bracket, adjust the angle and fasten the speaker with a click Enjoy enhanced-quality sound outdoors with the Polk Audio Atrium 8 DSI All-Weather Outdoor Speaker. Polk Audio Atrium8 features a single/dual input switch, which allows you to use it either as a virtual stereo speaker or as part of a traditional L/R stereo pair when used with a second speaker. Polk Audio Atrium 8 Outdoor can output up to 125W of continuous audio and is designed to withstand UV rays, salt, fog, extreme temperatures, and heavy rain. Atrium 8 includes mounting bracket and hardware. Polk Audio Atrium all weather outdoor speakers can be mounted either horizontally or vertically. Polk Audio Atrium Series Speakers are All-Weather Certified, and exceed baseline industrial and military specifications for environmental endurance (ASTM D5894-UV Salt Fog, Mil Standard 810 Immersion, Mil-Std 883 Method 1009.8 for salt and corrosion.) These Certification means Polk Atrium speakers can effortlessly withstand the outdoors, and hold up in extreme temperatures and precipitation. Polk Audio Atrium 8 All-Weather Speaker 6.5" Dual Voice Coil Dynamic Balance aerated polypropylene cone, two 1" anodized aluminum dome tweeters and a UNIQUE PATENTED SINGLE/DUAL INPUT SWITCH – use as single high-performance speaker or as L/R pair