Compact self-defense devices and alert systems

A self-defense system, comprising:

• a self-defense device comprising:
• a spray nozzle including a button and configured to receive a cartridge of an inflammatory agent, wherein the spray nozzle is configured to spray the inflammatory agent when the button is engaged;
• a sensor configured to detect when the spray nozzle is spraying the inflammatory agent;
• and
• a communication module configured to transmit a signal to a mobile device in response to the sensor detecting that the spray nozzle is spraying the inflammatory agent;
• and
• a remote server configured to:
• receive the signal of the self-defense system via the mobile device;
• receive a description of an incident that is associated with a use of the self-defense device and was collected from a user via an app on the mobile device;
• and
• transmit an alert to one or more preselected emergency contacts in response to receiving the signal.

A compact self-defense device, comprising:

• a housing defining a chamber configured to house a cartridge of an inflammatory agent;
• a spray nozzle including a button and at least partially housed in the housing, wherein the spray nozzle is configured to receive the cartridge in the housing, and wherein the spray nozzle is configured to spray the inflammatory agent when the button is engaged;
• a frame housed in the chamber and to which the spray nozzle and the cartridge are secured;
• a sensor housed in the chamber and configured to detect when the spray nozzle is spraying the inflammatory agent;
• and
• a communication module housed in the chamber and configured to transmit a signal for alerting one or more preselected emergency contacts in response to the sensor detecting that the spray nozzle is spraying the inflammatory agent.