Works great. It could be a little louder. Only four stars because it was advertised as the battery replacement version but this is the one that you have to trade in to replace the battery.
If you your cat is going out for the first time or your scared if your cat doesn't comes back. Please, do not use this as a gps or tracker for a cat. Its not safe because ive tried it. And its verry hard to look for them while using this device. Maybe just use it in keys or something else inside the house or just near to you. But not in pets going outside the house.