Product Review

How Dose It Work? Insert a standard 9V  battery into the unit. The unit is automatically activated by the sound of barking. When the device is within the range of a barking dog, the microphone will isolate and pick up the barking dog to emit an ultrasonic sound to silence the dog. 
 Features:   Use ultrasonic to stop dogs from barking Decorative pavilion design Durable and waterproof.  Safe and humane method for bark control, can be used on all breeds and sizes of dogs Two-color indicator shows whether the power is sufficient Powered by 9V battery(batteries not included)
Specification:  Material: ABS Plastic Size: 4.61 x 6.57x 5.31 in Power: 1 x 9V battery (not included)   LED Color: Green (good)/ Red (low battery)
Modes:   T - Verify the microphone and speaker are functional 1 - Low Range(Up to 15 feet)  2 - Medium Range(Up to 30 feet) 3 - High Range(Up to 50 feet) 
Note:  1. The product will not work on deaf or hearing impaired dogs 2. Human cannot hear the ultrasonic sound, however precautions should be taken when preparing the outdoor bark control for use
Package include:  1 x Anti Barking Device 1 x User Manual