Our boy Pete had been
Our boy Pete had been wearing the Whistle 3G model for approximately 5 years. We had to replace it just before the new 4G model came out. When we got the notification that AT&T 3G service would would cease working, we ordered the Whistle Health & GPS. It works great and is a lot more accurate and timely in reporting than the old Whistle. Not long afterwards the Whistle got caught against the door facing when Pete ran outside to dispatch several squirrels at our back yard bird feeder. That is why we had to get a new collar attachment. All is back to normal.