A citronella collar includes a microphone that is designed to detect the sound of barking or a rubber-coated sensor disc that detects the vibrations of the larynx that occur when a dog barks, and a unit that releases a ‘cloud’ of citronella-scented spray.

Activation

The microphone on the collar is triggered when it detects a bark, when this happens the citronella spray is released from the unit containing the citronella-scented mixture.

A representation of how the collars are activated and how dogs typically respond to the ejected spray