Drag Racing Starting Line Practice TreeWith this shirt pocket sized perfect launch portable Christmas tree, you can perfect your launch skills and reaction time almost anywhere, learning to hit 0. 000 out of the bleach box numbers at the track. This precision portable electronic device (4. 5 X 2. 75 X 1) makes a perfect affordable gift for the pro racer, would be racer, or anyone who just likes the thrill of competition. The perfect launch reaction timer features a remote thumb trigger, .