Tagg GPS Pet Tracker - Dog and Cat Collar Attachment Track Your Pet Using an Award-Winning GPS Pet Tracker that Sends Text and Email Alerts When Your Pet Gets Out View and Track Daily Exercise Levels to Ensure a Healthy Happy Pet Free Award-Winning Apps - iPhone and Android Receive Alerts When Your Pet Gets Out;Attaches to Your Pets Current Collar Interactive Map - Directions to Your Pet Fits most collars, but not recommended for dogs under 10 lbs Attaches to Your Pets Current Collar