Paid $120 for it at a rice rocket shop. Adjustable in 1 sec. increments, from 0-10 minutes. Looks like a three wire splice into the ign. switch. Digital display, and takes care of a few other functions as well. The only one useful on a diesel is it displays battery voltage and has an adjustable warning (10-15v). Made by a company called Apex, and it's about 1/2" round by 4". Silver, so it matches my silver bezel trim.