| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an interphone device capable of improving user-friendliness.SOLUTION: The interphone device includes: a voltage measurement section 32 that measures a value of a supplied voltage; and a master unit control section 28 that, when the supplied voltage lowers exceeding a predetermined fail-safe value, controls an intercom master unit 20 to shift to a low power consumption mode within a range smaller than the fail-safe value to control the operation of the intercom master unit 20 according to the decrease of the supplied voltage in a step-by-step manner.</p> |
