Abstract: A self-defense device is disclosed. The self-defense device includes an alert unit which alerts others to danger when activated. The self-defense device also includes a defense unit which can be used to disable or repel an attacker when activated. In a particular embodiment the alert unit is an air horn. In a particular embodiment the defense unit is a canister of self-defense aerosol spray. The self-defense device can include a coupling device which couples the defense unit to the alert unit. The self-defense device also includes a trigger which activates both the alert unit and the defense unit. The trigger has an ON state and an OFF state. The trigger can include a first trigger portion, a second trigger portion, and a trigger portion coupler. The trigger is coupled to the coupling device in some embodiments.