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Save a few pennies buying two instead of one!
This lid (code S99-S04-2) may be used to install the Slot.it universal digital 'type C' chip on any Scalextric or Slot.it PCR compatible chassis: the type C chip clips in place and the LEDs are properly aligned with the chassis.
Read the Type C manual available from the oXigen download sections of the Slot.it site.
This product is not a toy and it's only suitable for model makers of at least 14 years of age.