I purchased the Land Air See 54 for auto mobile security. I have found the following features impressive!!! First off, the available insta-fence. Once activated, the fence has a barrier around the vehicle and once it travels outside the fence you get an alert via text. In addition, the APP is super user friendly and you can see where the car is heading. Also, the magnet is powerful. Put it anywhere on metal and you won't loose it!! You can check the power level via APP and so far with my plan of 60 second updates, the battery needs charging every 14-16 days. i have been using this now for almost a year and am looking into the hard wire feature to alleviate the need for charging..