Very easy to assemble for anyone with even minimal soldering skills. My only criticism of the (optional) backup battery connection is that the screen printing swapped the GND and + connections. Fortunately, the electronics are protected by a diode, so an accidental change of direction will not damage the device. The instructions are in Chinese only, but it only took a few minutes to figure out the controls. It should also be noted (and probably described in the Chinese instructions) that the +buzzer terminal is the longer of the two wires coming out of the device. If you reverse the buzzer, it won't work.
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