The Prisma Electronics Multi Driver Stopwatch enables the user to time up to 4 riders simultaneously.Simultaneously time up to 4 drivers / ridersAll times are shown on screen at the same time for easy referenceDisplays the time difference between the last lap and best lapThe Prisma Electronics Multi Driver Stopwatch allows up to 4 drivers / riders to be times simultaneously with up to 9 split times per driver. All 4 times are shown on screen at the same time and after each lap the difference between the last lap and best lap are displayed.The display features a back light for easy viewing in all conditions and an ambient light sensor adjusts the brightness to suit.