It is a device that allows you to get your lap times in the palm of your hand. You can see the laptimes on the large LCD display and hear it audibly using a separate earpiece (not included in the package). You can even choose to have the LapCeiver A.L.T. tell you if the current lap is faster than the previous laps.

Transponder Mode This mode works with a Timing & Scoring System and the transponder that you have on your car.  The transponder sends a signal to the Timing & Scoring System that your track is using and a LapCeiver transmitter connected to that system sends the same signal to the LapCeiver A.L.T.   You can input the serial number of up to 5 transponders into the LapCeiver A.L.T., one in each of the 5 memory banks. Each memory bank will hold up to 500 laps.

Infra-Red (IR) Mode This mode works with an IR transmitter that is set up across the track. When your car passes through the beam, the Infra-Red Detector, mounted on your car and connected to the LapCeiver A.L.T., detects the beam. It then sends it to the LapCeiver A.L.T., triggering the timing, which shows up on the display. In this mode you use one memory bank at a time. You see your times on the track and you can try different driving styles or different lines to get the quickest times. Times are stored and can be recalled once you are back in the pits.