TRULY PRO-GRADE AUDIO - Audiophile sound reproduction from ribbon horn tweeters and 5.5in woofers DESIGNED BY PHIL JONES - Aesthetics and technical aspects designed by Phil Jones to create a professional grade sound WIDE ARRAY OF INPUTS - Optical, Coaxial, Bluetooth 4.0 aptX, and RCA Inputs BUILT-IN AMPLIFIER - These bookshelf speakers come in pairs. One has a built-in amplifier to be used with computers, TVs, record players and more. 2 YEAR WARRANTY - Guaranteed high quality and reliability with hassle-free parts and labor warranty for two years in USA and Canada.