Kanto YU3 4" 2-Way Powered Bookshelf Speakers with aptX Bluetooth 4.0 - Matte Grey (YU3MG) 2x Optical (TOSLINK) Audio, Bluetooth 4.0 with Qualcomm aptX, 3.5mm mini-jack AUX, RCA L/R Inputs 30 Watts Per Channel Class D Amplifier, 4 inch Kevlar drivers, 1 inch Silk Dome tweeters Subwoofer Output Remote Control included, Each speaker measures 5.5" W x 7.5" D x 8.6" H (14 W x 19 D x 22 H cm)