(a) In a sheet metal case, with output lead of 1.5 m. twin core and crocodile clips for connections to the battery. For use on 220 V 50 Hz AC. Output 1.5 A maximum at 12 V.
(b) As above but with bigger dimensions and with output 2 A maximum at 12 V, mains consumption 48 W.
(c) Output 4 A at maximum 12 V, consumption 85 W at full load.