Alert system, delivery system and method and door bell system
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United States of America Patent
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Aug 25, 2020
Grant Date -
Aug 16, 2018
app pub date -
Jul 22, 2016
filing date -
Jul 24, 2015
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Abstract
Alert device comprising electronic circuitry and at least a first antenna, wherein 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, wherein the second signal differs from the first signal, preferably in at least one of transmitting energy, transmitting frequency, coding and pulse length, wherein the device comprises 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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