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dan...the first item appears to be a controller for a tunze 6100. The second item is the controller.
The first item is a transformer used for a tunze powerhead which was discontinued about 3 years ago. You can still use them (i do) but if any of the parts die, tunze will not replace and will simply get me a discount on a newer version of their tunze pumps.
Obviously one cannot tell just from looking at that hockey puck whether or not it still works, you need the tunze 6000 powerhead (it's this brown or black powerhead...kinda bulky).
I'd be interested only in the puck as a back-up. Let me know.