Doctor who tardis 4 port passive on off switch light effect demo button usb hub flashing lantern and tardis sounds the tardis lantern flashes and makes authenic tardis sound effects each time a usb device is plugged in you can turn the sound off or on by using the on off switch on the back of the tardis hub to see and hear the effect when you choose simply push the demo button located on the front of the tardis hub works on mac and pc features 4 ports authenic sound and light effects o