Hey drag racing fans, this little gadget is seriously cool for improving your reaction times! It's this shirt-pocket sized practice timer that lets you work on your launch skills anywhere - whether you're at home, in the garage, or just killing time. The thing actually teaches you to hit those perfect 0.000 reaction times that separate the pros from the amateurs. It comes with a remote thumb trigger and has both .4 and .5-second PRO and FULL tree settings, just like you'd see at actual drag strips. There's even an adjustable delay box, bump down, and rollout features if you know what those are (and if you don't, the instructions will get you up to speed quick). It tracks your total clean runs, average reaction time, and red light counts so you can actually see your progress. Whether you're a serious racer looking to shave milliseconds off your time or just someone who loves competition, this portable trainer is surprisingly addictive. It's one of those tools that makes practice actually fun while seriously improving your skills. Your starting line reaction will never be the same after using this thing!