PetSafe Pawz Away Indoor Pet Barrier & CollarPut a transmitter near anything you want your dog to avoid.Place a transmitter and set range from two to 12 feet.Fit collar on your dog.Enjoy your dog-free zone.Extra add-on transmitters are availableThe fast and easy way to help your dog avoid problem areas.Designed by professionals to instantly keep your dog away from problem areas in your home--no training necessary. You can put a transmitter near anything you want your dog to avoid--the trash, kitchen counter, dining room table, baby's crib, or protect your fine furniture. Your dog's collar safely reminds him that this space is off-limits.The comfort collar will easily fit any size dog. Your dog's collar will work with as many transmitters as you have problems areas (Extra transmitter sold separately). Each transmitter requires three AA batteries, not included.Cordless system is portable. Great for travel..