Simple resistor dummy load. Consists of four 43 ohm 5W resistors connected in parallel to get 11 ohm 20W and one standalone 43 ohm 5W. Good for testing power supplies. The kit has DC jack and screw terminal on input and two screw terminals on output to measure voltage and current. Back side has a table of currents you can expect when you connect given voltage on given resistor.

How to use it?

Connect voltage source on the input. Connect multimeter current probe between GND terminal and 11 ohm/43 ohm terminal. Or you can just connect wire if you don't need to measure current. Comes as a kit, you need to solder it by yourself. Caution: may get hot, do not leave unattended.