The SportDOG Deluxe Bark Collar is the most advanced bark control collar ever made! Some bark collars detect barking with a microphone and activate on sound; these types can be set off by other noises or by another dog's bark. Other bark collars use only vibration, and can mistakenly be set off by motion or jostling. The patented Perfect Bark (TM) Technology used in the SportDOG Deluxe Bark Collar simultaneously senses both sound and vibration, and only a combination of the two will trigger the electronic correction. Note: