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Intelligent charm amulet,As a set of two,can pass key to simple communication between
each other.When some children go to school alone,parents don't know their security will
be very worried,press the green button to tell their parents have to get to school safely.
If on the way, danger, press the red button to sound an alarm in time.
When a press the green button, and the
other a melodious sound, at the same
time a green light will be bright.When a press the red button, and the
other a shrill sound, at the same time,
the red light will be bright.