RADIO ALARM UNIT

摘要

PURPOSE:To prevent effectively a stray child by using a radio alarm unit generating an alarm tone when a distance between a slave set and a master set is a prescribed value or over. CONSTITUTION:The slave set 1 given to a little child or a schoolboy sends a pass word code. The master set 2 discriminates whether or not the device code of a sending slave set and the pass word are coincident and sends another pass word when they are coincident. A slave set 5 receiving an alarm discriminates whether or not the device code and the pass word of the master set in the signal from the master set 2 are coincident and operates an alarm tone generator. The alarm tone generator generates an alarm tone so as to confirm the location of the transmission slave device 1 at the reception alarm slave set while the master set 2 is used as a repeater when the distance between the transmission slave set 1 and the master set 2 exceeds a setting value.