PestZilla&Atilde;&cent;&Acirc;&bdquo;&Acirc;&cent; Dog Repellent and Trainer + LED Flashlight / Handheld Ultrasonic Dog Deterrent and Bark Stopper + Dog Trainer Device by PestZilla Emits a high-pitched sound pulse that's inaudible to the human ear but highly irritating to dogs Effectively stops barking and threatening dogs from up to 50 feet away. Deter unwanted behavior such as digging, chewing on furniture, jumping on guests, barking, etc. 100% harmless to dogs and safe to humans; emits high pitched sound. No harmful sprays or chemicals. Safe & Reliable Self Defense; 100% harmless to dogs & safe to humans. Features also LED flashlight.