The Cat Caller Additional Keychain Remote Locator *BEST* Pet Tracker Small Enough for Cats & Small Dogs works with Single Pack or Multi-Pet receivers. Save 50% Now! THIS SPECIAL* 50% OFF* is PURRFECT for Multi-Pet Families! This additional key-chain remote work with all of The Cat Caller Pet Receivers. Just press the color coded button for the pet you are locating and the tracking device.sends a wireless signal that lights up and beeps on your individual pet's collar. The red "All" call button locates all pets at once! Keep one in your purse, and the other by the back door or give one to your spouse & kids. You can never have too many. Call your precious furry family members anytime, anywhere, indoors and outdoors individually or all at once! Works through walls, closets and all those unimaginable places they like to hide. You can even train your pet to respond to the signal and come running home to you! Great for Mulit-pet households!