This will allow your signal to operate like signals you see on the street, green to yellow to red and back to green again.
It's compact design allows for simple installation inside of the signal on stand-offs (not included) or in a small project box outside of the signal. The dimensions are 2" x 2" x 1". The use of stand-offs is suggested. They can be found easily here on ebay. Mounting holes on this circuit board are approx. 1/8" diameter. High quality components have been used in the manufacture of this controller.
All boards are tested and functioning prior to shipping. We recommend using this on a gfi or similarly protected circuit and not in addition to other loads. Please be sure to read instructions enclosed and consult with a person with electrical experience if you have not previously worked with this type of item. This item is Not Returnable.