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Function:1,Total 9 digital display show 3 digital days and 6 digital HH:MM:SS countdown,display format is DDD HH MM SS
2, When it countdown to 00:00:00,it will subtract 1 from left days
Technical norms:
1,Time Format: 24hrs
2,Clock Precision: less than 2 seconds on a daily basis
3, Power : battery
