The barking triggers a piercing, high-pitched tone. Much of this tone s spectrum is beyond the range of human hearing, but dogs find it undesirable and distracting. Much of this tone s spectrum is beyond the range of human hearing, but dogs and cats find it undesirable and distracting. Uses two common 3 volt batteries . Safety features include protection against false signals .
Break alarm warns when wire has been broken.
Extra surge protection for storm prone areas. Safety features include protection against false signals. Uses two common 3 volt batteries. No installation, no burying wire, no stakes. Uses convenient camera batteries.