GRETA is the most innovative tracking system made in Germany! With three different tracking systems (GPS, GLONASS and GSM) GRETA not only knows exactly where your animal is, GRETA also warns you when your animal is overheating! In addition, the speed warning notifies you immediately if your pet moves unnaturally fast - in other words, if your pet is abducted in the car. GRETA warns you by phone around the clock - so you don't miss a warning. Never worry about your pet again when you can't be with it - GRETA looks after it for you!