This is a mixer design kit for Mini-Circuits SIM series mixers. Each kit includes one PCB with three edge mount SMA-F connectors. All you have to do is solder the mixer and connectors on to the board. Mini-circuits has a wide range of mixers with this footprint - HV1195.
The SMA connectors included with this kit are suitable for a maximum operating frequency of 8 GHz.
The kit does not include a mixer.