Counts down from 21 at the beginning of the clearance state (flashing hand). Housing is by ICC. The LED module is made by Quixote (pronouced "kee ho tee")
Here is a pic of the interior. Very simple connection Walk, Dontwalk hot leads, and neutral. There is a very simple onboard computer that counts the amount of flashes the dont walk has. While it's recording the cycle the counting is dark (usually the first cycle, unless i retime the controller). It's wired up at the cabinet like any other pedestrian signal