Correct, the box/slave is never turned on. A lot of people remove the battery from the box just to make sure. All signals come from the master so no extra binding is required. Just trimming of the slave so it and the master are in the same trim. That is done for the most part on the ground, sometimes in flight the slave may require a slight bit of trim in flight. When I set up one of my planes on a box, not always a trainer but even a stunt plane I have an experienced pilot fly the box to make sure it is in trim, you get very close on the ground though. I get a kick out of letting people fly my Hots on the box but I have never allowed anyone to fly my planes by themselves. The Hots is something special though and I like to see others try to fly it. It can get away from you very fast.