good point on the 240. if so lucky them. thing run better at the higher voltage. 

i have not found a refferance to the defult voltage.

in the  /etc/config/cgminer the last line is blank but after putting in a voltage on the GUI it is added as the last line.   no line default voltage. what that is ?   not sure currently trying to reverse engineer this thing but work is getting in the way

https://bitmaintech.com/files/download/BM1382_Datasheet_v3.0.pdf
page 3 shows the chip speck