Uses ultrasonic sound to eliminate or reduce excessive barking
Microphone detects your dog's barking to ensure another dog barking or other noises will not cause a false correction
Water resistant collar is suitable for light rain or wet grass exposure
Replaceable 3-volt lithium batteries (included); Includes low battery indicator
No Bark Guarantee: Some dogs may not be responsive to ultrasonic correction. If this product is not meeting your needs, call, chat or email the PetSafe US-based customer care specialists.