In Japan, a conventional security buzzer for children is attached to the a side of the school backpack, which is often unreachable by the child. In addition, the buzzer, which turns on by pulling a string, is often set off by accident. This buzzer is attached to the front strap of the backpack, making it easy for the child to reach it quickly and press the button, which is near their chest. In addition, unlike the conventional pull-string, the buzzer can be easily turned on just by holding the buzzer with one hand. At the same time, the buzzer does not turn on by pressing only one switch. The double-switch system reduces accidental use.