Ultrasonic Dog Repeller Training Device w/ 2-LED Flashlight - Orange (1 x 9V) Protects you from vicious dog attack, Trains pet to be obedient, corrects misbehaviors and stops barking,Effective yet no harms to dog Dimension: 130 X 40 X 22 mm Frequency: 25 KHz Power: 9V battery Please note: it usually needs at least 2 weeks to take effect for dog training