Cox .049 Black Widow RC Airplane Engine-Used-OB

This is a Cox .049 Black Widow radio control airplane engine in original box with instructions. It was my deceased brother-in-laws & all I know about it is that it is used but was working fine the last time he used it. Please look at picture & feel free to contact me with any questions. I will try to answer them.I can accept Pay Pal only Shipping within US $5.00