Definitive Technology C/L/R 2002 Speaker (Single, Black) - Exquisite design with excelsior craftsmanship. - Outstanding sound quality powered by 3D dynamic sound technology: 01 Audio Bluetooth desktop and book-shelve speaker is equipped with two 15W HD drivers, two 8W tweeters and inverted-image audio tube that produce exceptional quality of bass. - Reliable wireless connection and broad compatibility: Latest Bluetooth v4.1 technology ensure seamless audio streaming from your portable devices such as cellphone, tablet PC and laptop. - Versatile input mode: Bluetooth, Line-In, Radio, TF-Card direct play. - Power source: Direct DC-In 18V==2A (Without built-in lithium battery), AC adapter: 100-240V ~ 50/60Hz