The automatic timer and the pre-setting timer, battery voltage indicatory functional former function that way, the circumference lap which is convenient to battery warning function and circuit travelling et cetera, passing lap measurement function, in addition, the lead/read lap function which can designate data verification as after the measuring, memory of the maximum of 30 laps is possible. (With other companies make 5 - 10 laps) When installation is made to do in order, the safe circuit at vehicle speed wires with the safe circuit as more secure ones, furthermore active function increased, speedometer indication, speedometer peak hold and speed warning function, 0 - the 200m, 0 - the 400m, 200 - the 400m, 0 - the 100km/h, 0 - the 200km/h, loaded the attack mode function which can measure various time attacks of 50 - the 100km/h.