Box
The delay box is optional . In some classes it's not allowed. Basically it allows you to leave on the first amber in bracket racing. The lights go amber, amber, amber and green unless you leave early. If you leave early there is no green, only red. There is a half second between each amber. So, you have 1.5 seconds before the green. The reaction time of you plus the response time of the car is what you try to minimize. The delay box allows you to release the trans brake at the first amber and it waits the amount of time that you dial into it before the transbrae actually releases. This allows you to focus on one light, rather than three. If you stage consistently, you can be deadly on the tree. Hope this helps.