With 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, .4 and .5-second pro and full trees, plus an adjustable delay box, bump down and rollout. If youre n ot familiar with those terms, the included instructions will have you pounding the win lights in no time. Included 9-volt powered perfect launch shuts down automatically (no chute required!) for longer battery life and its affordable fun! Sold individually. Back by a limited 3- day factory warranty.