3 out of 5 PerTracer is fantastic in terms of its GPS capabilities and long battery life. If you have it in standard mode you can get 3 weeks before having to recharge and a month if in slow mode! I charged once weekly in Fast mode for one of my cats who likes to go outdoors but kept my indoor cat’s tracker in slow mode. After a few weeks I then changed my outdoor cat’s collar to standard mode which does the job. You can change between modes easily so it doesn’t really matter. If your cat goes ‘walkabout’ you can always change the mode via the app remotely to get more regular GPS information. I haven’t tried the radio frequency mode yet as it’s a total pain having to go on to my desktop computer to change the mode as it can’t be done on my mobile devices. This is a great inconvenience as there is no easy way to switch between GPS and radio frequency. Imagine you lose your cat, track to its last known GPS position but puss has gone then you have to go all the way home to your computer to change setting to radio frequency then take charging unit out with you attached to a mobile battery pack to pinpoint exact location! I mean, really? PetTracer set up is not very user friendly but if you persevere and set it up correctly then it works brilliantly. In a nutshell; accuracy brilliant, battery life excellent but set up laborious and tricky and no way to seamlessly switch between GPS and radio frequency settings. My collars also arrived with a broken plug for the charging unit.