The description of work principle: First, green lights are flashing at the ... down like sands, and must be reach The description of work principle:First, green lights are flashing at the ... interval, in the last 3 seconds, In the middle of the top funnel part show the time 3,2,1 ... , achieve funnel effect by control LED lights off.The functions of controller:The time on the screen is adjustable,counted by ...