Its pros: The device is very small! At idle, the voltage is about 70 volts. In a set of wires of 16 sq. Mm (written), how much actually needs to be measured in operation, let's see. For this price a gift! Some cons: There are balls of solder on the board, even a smd transistor was lying around inside, but it didn’t seem to be checked from its board, it probably flew in when assembling from somewhere, it seemed like they were soldering on their knees in a hurry.