Handheld ultrasonic bark control and training device

The pictured item is a handheld ultrasonic bark control and training device designed to deter dogs from barking. It emits a high-frequency sound, inaudible to humans but disruptive to dogs, to interrupt barking and other unwanted behaviors.
Function: Emits ultrasonic sound to stop barking.
Range: Effective up to 50 feet.
Safety: Generally safe for dogs, but not recommended for those under 6 months or over 8 years old.
Usage: Can be used for training and to deter unwanted behaviors like digging or chewing.
Power: Rechargeable via USB, with a battery life of up to 30 days.
Additional Features: Some models include an LED light for nighttime use.
Effectiveness: Varies depending on the dog; some may not respond.
Training Aid: Best used in conjunction with other training methods and positive reinforcement.