I purchased several of these from ebay:
Here is the link I used:
When I received it, I realized it doesn’t have the same pin outs as the sparkfun converter I had previously used. At first glance, 5V and GND seem to me to be the output and IN+ and IN- the input, but the D+ and D- threw me.
So I took it to the local makerspace and asked if anyone knew how to wire it. One of the guys there says the D+ and D- are for USB. Chances are one could wire a USB socket to this board. So D+ and D- can be ignored.
Input Output IN+ 5V IN- GND
Once it was running, I realized it has a little LED on it to indicate it has power. In my case, I wanted to use a battery so I didn’t need an extra power drain. I carefully crushed the LED with wire cutters, then removed the residue with an exacto knife.