Product works fine. I definitely don’t like the fact of any written instructions, only graphics which I am not a huge fan of. The solar panel also has no suction cups/pads or any fixing of any kind, which seems to be an oversight in my opinion. What I want to know and need to find out if I use the solar panel for an extended time will it overcharge my car battery? Therefore I only use for a couple of days at a tine and use my mains powered intelligent car battery charger/ maintainer if using for longer periods. Is ideal if no external power point available.