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1. With 4 timing rules such as positive timing, countdown timing, bonus per step, delay per step 2. Different basic time and auxiliary parameters can be set on the left and right side 3. The timing parameters of both sides can be modified during the race 4. Power on again after shutdown (non-power off), keep the rule parameters used before shutdown 5. Can be set to mute or alarm tips 6. Power supply: 1 AA battery power supply (not included) 7. Size: about 14 x 4 x 9.5cm 8. Weight: about 285g
