Principle of Operation: At the beginning, green led light on the upper half, then flows to the lower half like sand. ...

Principle of Operation:

At the beginning, green led light on the upper half, then flows to the lower half like sand. The process will finish in a certain time. At the last 3 seconds, the screen will turn to yellow, the sandy clock will show “3, 2, 1”, then screen turn to red. Like the green color, at the last 2 seconds, the screen turns to yellow, the cycle will go on…

Function of control system:

1. Control time of the funnel is adjustable, 1 second is a unit.

2. Display order of the color is adjustable.

3. The operation is completed by key-press.

LED sandy clock traffic light