Electronic Handheld Dog Repellent and Trainer with Flashlight / Powerful Ultrasonic Bark Stopper Dog Deterrent and Dog Training Device TRAINING TOOL - Dogs will learn to stop barking and all other unwanted behavior by associating disobeying with hearing this harmless sound. Deter unwanted behavior such as digging, chewing on furniture, jumping on guests, or barking. PROTECT YOURSELF - Effectively stops barking and threatening dogs by emitting a high-pitched ultrasonic sound that's inaudible to human ears but highly irritating to dogs. (Also has the option to make the sound audible) FITS IN POCKET - Small, but powerful, the SoundProducts Electronic Dog Repellent fits comfortably in your pocket to protect yourself while walking, cycling, jogging, etc. BUILT-IN LED FLASHLIGHT - Doubles as a flashlight when you need it! 100% HARMLESS TO DOGS & SAFE FOR HUMANS - This device does not harm the dog. Also seems to have no effect on cats, birds, etc... so can be used while not disturbing other pets!