There are no wires in this photo. 1 and 2 are the lines into the transformer, which are the power supply of the digital switch, and 3 is the zero line of the lamp. 4, 5 and 6 are the live wires of three lamps, which can be connected in parallel, so that three and three parallel wires are the two wires of the lamp wires. Connect the incoming line, and connect a switch between the parallel line of the incoming line and the live line.