Sound Defense K9 Warning Device Handheld dog deterrent - dogs, coyotes, and wolves Works from up to 25 feet away and has a wide effective field Safe and easy to use, humane No Blowback or over spray means no chemicals in your face or eyes Dog repeller used by professionals and consumers around the world Fully audible and loud signal specifically designed for a dog; Sound focuses in on the sensitive hearing range of the dog Chemical free; No over spray or blowback and no propellant used Can be used from a distance; Does not require the close contact necessary with physical threats Does not require precise aim; Wide "Beam Angle" Does not harm the dog when used as instructed