Seal that announces "Here I am!"

Name :
TAKAHASHI Rin
COUNTRY :
Japan / Ishikawa
AGE :
8
YEAR :
2019
PRIZE :
Asahi Shogakusei Shimbun Prize
COMMENTARY :
Put this seal on an important object and register it with this device. When that object gets lost, pushing a switch makes the seal play music so that the object can be found.
Seal that announces "Here I am!"