由2个外部单刀单掷开关来完成所有时间的设置。可选择12小时或24小时两种显示模式。该电路可通过内部5V 的电压调整器由电池进行供电或使用一个外部固定的电源供电-by two external single broadsword single throw switches all the time to complete the installation. Choice of 12-hour or 24-hour two display modes. The circuit through internal 5 V voltage regulator for electricity from the battery or the use of an external power supply fixed