Solar 12v Battery Trickle Charger?

[Durwood101]

Not sure if anybody has happened upon this, but I was at Lowes looking for some heat shrink tubing and I happenned to run across this. It's a 12v "solar" trickle charger. On the package, it says good for use on rv's, boats, trucks, "weatherproof". Anyone thought of trying this out, it looked like it could be fit right across the bow, or even near the stern if you had some room.........might be kind of hard for a permanent install given the deck space most people have on kayaks..but, in an emergency situation, wonder how well it would work? Here is a pic of it.