| 摘要 |
PROBLEM TO BE SOLVED: To provide an electronic key device capable of further surely determining whether or not battery voltage of a portable machine is dropped even to a difference in a use environment and a solid variation in a battery. ! SOLUTION: A radio master machine comprises an each portable machine battery voltage drop determination part for comparing battery voltage information with a battery voltage drop determination threshold value set with every key number of a plurality of portable machines, when identification information transmitted from the portable machine can be authenticated as the identification information of the portable machine stored in a first storage part, and the each portable machine battery voltage drop determination part determines as a battery voltage drop when the battery voltage information is lower than the battery voltage drop determination threshold value set in accordance with the portable machine. ! COPYRIGHT: (C)2014,JPO&INPIT |
