This is a regulator board. It tas a terminal strip with a common ground, input, and 5VDC output. Includes 1A fuse, filtering capacitors, and power status LED. Input voltage should be around 7.2VDC-24VDC.
An optional heat sink (as pictured) can be purchased with it too, which is recommended if the load is going to be much greater than 500mA. The heat sink option includes a machine screw and nut to fasten the heat sink. If desired you can get better heat transfer with heat sink compound.
We use these in our ATRs to supply a regulated 5V supply from a 9.6V battery to our motor controllers and/or RC receiver. The board is spaced out on 0.1" or more grid that is easy to solder with no surface mount components. The board is about 1.25" square.
Documentation and Support