Nice Apollo Control Boards
The Nice Apollo control boards 633/634 have been replaced by the 635/636 control boards. Upgrading to the next board can be slightly confusing if you don't remember which one you purchased. Looking at the board, it may be confusing as well since it will say 633/634 on it as in the below picture. This is due to using the same baseboard. The model number you don't have is covered up to save cost and ensure you get the absolute lowest price. The answer to knowing which one you have is simple, it all depends if you have a single or dual swing gate opener. If you have a single, you have the 633 and need to upgrade to the 635, if you have a dual, you have the 634 and need to upgrade to the 636.