This battery holder is designed for the series connection of 6 NiMH AA-batteries or 6 regular AA-batteries to power your device.
When using typical NiMH-batteries, the total voltage will be 7.2 V. When using regular batteries it will be around 9 V.
There are two free wires that lead off of the device which you can then use. You can solder a power jack to them, clamp them in a terminal block, Screw Jack, or even a terminal on a powered board or module.
This holder does not have mounting holes for screws, so you will have to mount it yourself.