I will write in detail because I was also dying for a realistic review before buying. So, it's worth it!!!
You buy it, it arrives at your home, you download and purchase the app with a subscription on Google Play. There are different packages. I put it on my 4kg cat, she didn't notice anything as she was already familiar with the antiparasitic collar she already has. It's not as big as it looks and it's very light, I would say extremely so. The live GPS does not show you the exact spot with 100% accuracy but a broader area where it is located. The truth is, sometimes it shows places where my cat hasn't been. For example, it showed on my screen that she was at the pharmacy, but she hadn't even crossed the street to the pharmacy (as I was behind her and testing the app). We were across from the pharmacy and it showed that she crossed the street to get there. The battery lasts satisfactorily. I only turn it on when she goes for walks. It charges extremely quickly and notifies you of the battery status. It has light and sound. You press the light on your phone and an LED light turns on on the cat's collar, a discreet but strong one that helps you locate her. It also has sound. You press and it rings, but the sound is not loud. It has other features like sleep, calories, etc., you can set dangers, e.g., cliffs, when it approaches a cliff it gives you an alert, but I don't use that as I said I only put it on for her outings. It fastens securely and supposedly unfastens if it gets caught, but I haven't experienced that. It's worth it as a device. You can be relatively at ease
