Dog Chaser "Electronic Dog Repeller"

"Dog Chaser" Electronic Dog Repeller - Product Review - "Using the latest ultrasounic technology, the SUPER DOGCHASER uses two ways to repel a dog. One is the discomforting but not harmful high frequency sound (20,000Hz-25,000Hz), audible to dogs but not to humans. And, the second is a super bright LED flashing strobe that temporarily blinds and confuses the dog. Helps stop the approach of unwanted dogs up to 40 feet." - Also available is the Mace Dog Spray, Epa Approved Muzzle provides safe, effective and humane protection against canine attack. Ideal protection for walkers, joggers, cyclists or delivery people."