Alarm systems, alarm devices, alarm activation methods, alarm system retrofitting methods, and alarm system network establishment methods

An alarm system comprising:

• at least one wireless alarm transmitter;
• at least one wireless activate transmitter;
• and
• at least one wireless signal receiver that becomes sensitized to recognize an alarm code from the alarm transmitter after recognizing an activate code from the activate transmitter, the signal receiver comprising an alarm generator that provides a first alarm after recognizing the alarm code.

An alarm system comprising:

• at least one wireless alarm transmitter positioned to exhibit an effective transmission range encompassing at least a portion of a first structure;
• at least one wireless activate transmitter exhibiting a lower transmission range in comparison to the alarm transmitter and positioned to exhibit an effective transmission range substantially encompassing at least one entrance of the first structure while excluding any adjacent entrance of a second structure, at least a portion of the second structure being outside the effective transmission range of the alarm transmitter;
• at least one wireless signal receiver that becomes sensitized to recognize an alarm code from the alarm transmitter after recognizing an activate code from the activate transmitter, the signal receiver comprising an alarm generator that provides an alarm after recognizing the alarm code;
• and
• at least one hazard condition detector that prompts the alarm transmitter to send the alarm code after identifying at least one hazard condition.

An alarm activation method comprising:

• transmitting an activate code from at least one wireless activate transmitter;
• recognizing the activate code with at least one wireless signal receiver;
• after recognizing the activate code, sensitizing the signal receiver to recognize at least one alarm code;
• transmitting the alarm code from at least one wireless alarm transmitter;
• after sensitizing the signal receiver, recognizing the alarm code with the signal receiver;
• and
• after recognizing the alarm code, providing a first alarm from an alarm generator comprised by the signal receiver.

An alarm system retrofitting method comprising:

• linking at least one added wireless alarm transmitter with an existing alarm system, the link allowing an alarm actuation signal of the existing alarm system to be extended to the wireless alarm transmitter;
• providing at least one added wireless activate transmitter;
• and
• providing at least one added wireless signal receiver that becomes sensitized to recognize an alarm code from the alarm transmitter after recognizing an activate code from the activate transmitter, the signal receiver comprising an alarm generator that provides an alarm after recognizing the alarm code.