OK, unfortunately the instructions for use are missing.
The item operates satisfactorily but it is totally manual. It is activated by manual switch not automatically by mixing with throttle lever like practically EVERY OTHER DRIVER IN EXISTENCE! Plus it arrived safely packaged in a reasonable amount of time but it was simply placed in a baggie, no label, no instructions nothing! Just an electronic device in a baggie that's it. What is with you people and not providing instructions for electronics? This is not the first item I have ordered off of this site where this has been the case. A slip of paper only costs a penny or so, print instructions on it and ship the damn thing with the device for God's sake...