AGC: With AGC and intelligent noise reduction algorithm so you can use it in noisy places. Features: 32 colourful lamp beads with eight display modes and five brightness levels. USB powered: Powered via a USB cable with the USB port (cable not included). Sound-activated: With a built-in mic so it can flash to the beating rhythm of the music. Light towers: Get one or two sound-activated rhythm light towers in black, silver or white! App-controlled: Upgrade for app-controlled lights, so you can easily adjust them. Sound-Activated Rhythm Light Tower | White | Living Social