They're safe for dogs 5-120 lbs, from 6 months to 8 years old. The ergonomic design fits nicely in your hand, while a carabiner lets you take this ultrasonic dog bark deterrent anywhere. It has sound and ultrasonic modes with a frequency of 25 kHz that's hard for humans to hear.
eBay
Ultrasonic dog training technology: Advanced ultrasonic technology is used to effectively reduce the dog's barking behavior, which is harmless to the dog. Family training can easily solve the problem of dog barking.
eBay
Simple and easy to use, just install the battery to start, automatically sense animal activities within the range and emit ultrasonic to drive them away. The ultrasonic frequency is designed for dogs, humans cannot hear any sound, avoid noise interference to neighbors, quiet and efficient.
eBay
Ltrasound Dog Chaser. 1X Ultrasound Dog Chaser. It can also be used as a normal flashlight to illuminate at night. Ultrasonic wave reaches up to 125 db, audible to dogs but not to human. Ideal for preventing dog attacks, issue ultrasound to repel the dog or wild wolf.
eBay
Kaemingk Snowman LED Acrylic Figures Cool White.
eBay
Working Principle : The ultrasonic dog repeller emits 25KHz waves (audible to dogs 15Hz-50KHz). 1 x Ultrasonic Dog Repeller. which don't harm but deter barking and aggressive dogs.Target Audience: Effective for large, fierce.
eBay
Item Type: Dog Repellent. This product adopts double channel enhanced, double dog training, excitation drive dogs, liting function is one of the super ultrasonic. 1 Dog Repellent. Ultrasonic wave reaches up to 125db.
eBay
Ultrasonic Bark Stopper Anti-disturbing Outdoor Dog Repeller Sound Trainer Tools. Condition is New. Dispatched with Evri Postable.
eBay