timer reminder student question learning postgraduate entrance examination mute cycle 2 groups clock counting time management alarm clock

timer reminder student question learning postgraduate entrance examination mute cycle 2 groups clock counting time management alarm clock

计时器提醒器学生做题学习考研静音循环2组计时钟时间管理闹钟

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产品名称：2组可静音循环计时器

功能：正/倒计时循环计时

提醒方式：声音+闪灯

尺寸：84*65*19mm

显示屏尺寸：70*30mm

产品功能：2组计时同屏/记忆功能/声音可调/闪灯提示/99小时正计时/99小时倒计时/单组循环计时/双组循环计时

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