Quantity   Component name
1 × CD4017 CMOS decade counter
9 × push buttons or more
2 × RJ45 connectors no magnetics inside
1 × PCB one or two square inches
1 × extension/prototype board for your MCU/Pi/controller
11 × diodes 1N4148 or similar silicon PN junction for 0.6 to 0.7V
1 × filtering capacitor about 100uF should be enough, I suppose
1 × resistors