Aerosol canister must be used with the Time Release Dispenser Avian Fog Force™ TR Bird Repellent is a non-lethal automated time-release aerosol bird repellent. Avian Fog Force™ TR Bird Repellent’s active ingredient irritates bird’s pain centers, creating an unpleasant sensation when they fly through the fog. Birds learn to avoid areas that have been treated and seek other locations. Avian Fog Force™ TR Bird Repellent is dosed from programmable timed spray mist dispenser cabinets containing disposable aerosol canisters. Each dispenser cabinet releases an invisible intermittent aerosol bird repellent mist on a user selected programmable time-release basis. Spray mist dispenser cabinets can be placed strategically in areas where nuisance birds are a problem.