The RS999 comes complete , you only need to screw it on your rail mount in your airplane, they're design to accept 1/2" (12,7mm) mounting system legs. you simply connect it to your receiver and that's all.
can be programmed with our programmer board to reverse and to delay it , to have an more scale looking.
they're made in aviation label aluminium, very strong you'll not broke them...
sold by one