By “manual relay override” you mean a physical switch? Yes i installed a three-way physical switch next to the curtains, but it’s mostly done via automation. the motor can be fitted either left or right, with a white cap to place on the motor connection side not used. it’s very silent, and in no way would the quality make one assume they were from the Far East. The cord from the motor is about 100 cm long, and you have to buy your own switch, that’s it. The chap from the shop is very helpful, writes in English, he’s called Scott Liu from “Friend Industry Holding”, here’s the link.