1, L7~L11 a 12-minute countdown, the initial display 12-00,L13 and L14 24 and counting the initial display 24, two countdown at once 2, press the key K1 minute pause, start the countdown, press K2 control minutes countdown reset, reset values of 12-00 3, press the K3 control 24-second countdown pause, start, K4 control 24-second countdown reset, reset values of 24, ending 24-second countdown beeper ringing 1s 4, when the remaining time is less than 24 minutes seconds, stopping 24-second countdown 5, when the 24-second countdown with 3 seconds left, every 1 second reduction, the buzzer sounded a 12-minute timers, buzzer Bell 1s.

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