38 x 13 x 0.6 inches, 9 pounds.The unit comes with a long - 6'? - cable ending in a male-female bullet connector - don't know what it's called but it's a standard type for 12v wiring. From there it has several connection types which can be swapped out as needed: a pair of alligator clips large enough for clipping to battery terminals, a small LED indicator (I assume as a rough indicator of functionality), a male cigarette lighter adapter (for attaching to the lighter outlet of a car when trickle-charging), and a female cigarette lighter adapter (for connecting to accessories which have cigarette lighter adapters) and also one with a pair of bare (fluxed) wires on the end.