The image shows a QueenMew Handheld Ultrasonic Dog Trainer.
It is an ultrasonic device used for dog training and controlling excessive barking.
The high-frequency sound waves are inaudible to humans but capture the dog's attention.
It is considered a safe and humane way to interrupt a dog's barking pattern or other unwanted behaviors.
The device is rechargeable via USB and designed for both indoor and outdoor use.