AutoTrainer: Stops Barking Using Treats Keep your dog calm and quiet when you're away from the house by using food as a reward. The AutoTrainer rewards dogs for silence and witholds rewards when they are barking. The AutoTrainer collar communicates with the base unit when the dog is quiet or barking for the most accurate training Perfect Bark dual detection technology detects barking and vibrations to ensure the most accurate training Motion detection sensors ensure that the dog is actively participating in training, creating an interactive training environment Review your dogs history of barking and rewards on the screen of the AutoTrainer at the end of the day and track their progress Call, chat or email with our expert US-based customer care specialists six days a week; they are waiting to assist you and your pet with your product needs Collar requires 2 CR-2032 batteries (included); Unit requires 4 D size batteries (not included)