How the Lap Timing Sysem Works? It achieves the counting of laps and timing through infrared sensing between Transponder(on cars) and receiver(on receiver bridge) . The EasyLap Timer Scoring RC Car Live Timing System is an innovative and compact lap counter system, allowing users to track and record crucial data related to their RC car races, providing a comprehensive and accurate analysis of their performance on the racetrack. The product is equipped with a professional timing gantry. What Do You need to Prepare for connecting the lap timing system? 1.laptop/Computer, download software. Receiver Bridge 1.2M/1.5MSystem Requirements: 1.MacOS,Linux, Windows 2000 , XP, Vista, Windows 7,Windows 8 or 8.1 (32/64-Bit SystemSupport), 2.One available USB 2.0 port 2. Receiver Bridge 1.2M length, 40-50CM height Four power supply options: 1. MINI JST     2. SPORTS      3. JR SET      4. General lithium battery