Excellent device! I have a 2022 GLC 300 and I don't drive it very often (maybe once a week). The 12v battery drains quickly when it's parked due to all the tech sensors and signals on the vehicle always being on. This product was so easy to install and operate. Instructions and user manual were so easy to understand. Will never have to worry about my battery again! I just leave it connected whenever I'm not going to be using my vehicle and it unhooks in 2 seconds if I need to. So great!