This solar battery charger is basically a larger version of the MB3503. In sunlight, it supplies 15V at around 100-120mA of current.  This is enough to keep a  12V battery that is infrequently used topped up. Its ideal for that second car, ride-on lawnmower, tractor,boat, etc.

Its housed in a plastic case, and has an output lead to cigarette lighter plug, with a LED, which illuminates when the solar panel receives a charge.
Note, some cars will require this to be directly wired to the battery, as the cigarette lighter socket is disconnected when the ignition is switched off.

Size  370(L) x 160(W) x 20(D) mm