... VFD and digit tube display screen. 4, Karaoke function VFD Display USB/SD Karaoke 2.1 Multimedia Speaker Description:1,With usb ... function.3,Blue digit and VFD display screen4,Can add karaoke(two port) function if you need.5,Durable wooden surface ... :533sets/20gp,914sets/40ft,1295sets/40HQ VFD Display USB/SD Karaoke 2.1 Multimedia Speaker