Bluetooth 40W speaker black. Bluetooth 4.0 includes aptX for CD Audio quality wireless BT streaming as well as standard SBC and ACC. Audiophile performance in a small package (4.6" W x 8.5" D x 7.5"H) 36 watts RMS 50 Hz 20 kHz 3.5" woofer and 1" tweeter Supports audio from any Bluetooth device or wired aux in jack Volume BT link and audio source buttons on top of right speaker USB jack on back to charge smartphones (1 amp).