Alert system, delivery system and method and door bell system
Number of patents in Portfolio can not be more than 2000
United States of America
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Oct 29, 2024
Grant Date -
Aug 17, 2023
app pub date -
Apr 27, 2023
filing date -
Apr 27, 2023
priority date (Note) -
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Abstract
An alert device includes electronic circuitry and at least a first antenna. The circuitry is designed for sending out a first signal, for wireless communication with at least a first hand held communication device, and at least a second signal for wireless communication with at least a second hand held communication device. The second signal differs from the first signal, preferably in at least one of transmitting energy, transmitting frequency, coding and pulse length. The device includes a switch for switching between: a first mode in which only the first signal is transmitted and a second mode wherein the first and second signal are transmitted; or a first mode wherein only the first signal is transmitted and a second mode wherein only the second signal is transmitted.
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