Dog training & anti-bark: This ultrasonic dog repeller helps you train your dog correct barking, sitting, aggression and other behavioral obedience, also can keep you away from dog shock and attack.Easy to operate: The device has three modes: light only, light + ultrasound for dog training and light + ultrasound for aggressive dogs.Features: stop dog bark device is effective within a range up to 15m/49ft. The device is lightweight and easy to carry. With portable design, you can put this handheld device in your pocket or bag.Fit for domestic dogs: Our device is harmless to both humans and dogs. Fit for most common small, medium, large domestic dogs.Works by sending out an strong 125dB ultrasonic sound that only dogs can hear, and strong white light of 2800mcd, , which can produce strong stimulation to dogs and cats. Material: Plastic, Powered by: 1x 9V Tandem Cell（not include）Specification:Type #1 Size: Approx. 15x5x3.2cm/5.91x1.97x1.26inchType #2 Size: Approx. 12.5x4x2.5cm/4.92x1.57x0.98inchPackage Includes:1 Piece Ultrasonic dog trainer Note:Due to the manual measurement, there is a slight difference between the size from the above and the actual item.Because of the displaying and lighting effects, monitor settings,etc.there could be a little color difference acceptable, please kindly note.