The start timer displays the seconds counting down to zero (the starting time), sounds an audible electronic warning ten seconds before zero, then once every second from five seconds before down to zero, and once again five seconds after zero.

• 起始计时器显示到零的倒计时（从起始算起），在还有10秒时发出可听见的电子警告声，从剩下5秒起每秒响一次，零秒后5秒又响一次。