The Lap Trigger is placed next to the track and projects an infrared beam of light across the track that triggers the infrared sensor (SPM1453 - sold separately) in the car or truck each time it passes
Hook and loop straps included for easy mounting
Only one lap trigger is necessary at each track
9V battery included
Telemetry Handheld Unit (SPM1320 - sold separately) required to display lap times
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