PURPOSE: To inform the third person of a message and facilitate the search by starting a sound producer of a search subunit in receiving a call signal from a search master unit by a selective call receiver of the search subunit.

CONSTITUTION: A search subunit 1 is equipped with a selective call receiver (R) and a sound producer (S) which is designed to start when a call signal from a search master unit 7 is received through a receiving antenna 3 by the selective call receiver. The search subunit is assembled in a necklace, etc., for a pet and a message, etc., for requesting the cooperation in search for a stray pet, etc., can be transmitted from the sound producer to the third person.