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Assembly is well understood by explanation too explanatory enough.
It is also easy to assemble to peripheral equipment.
Desiringly, it is desirable for us to connect the capacitor for intermittent time selection of selective use to the two substrates with jumper wire ... exchange after soldering is troublesome work of removing solder.
I purchased it because there was no other such kit, but I hope I will improve the following two points. 1. The power supply is only the DC jack, and it is becoming a center minus which is now rare. 2. Relay contact output is soldered. With the above, it is good to increase the size of the board, some price increases, so I would like it to be an interface on the terminal block.