Although the Helicommand manual is not too bad it does leave a lot to be desired when it comes to setting up the unit. I would suggest that you have a look at the "heliguy.com" site. Within that site search for the video describing the set-up of the Helicommand 3a on a TRex 450. It provides a much more descriptive step by step explanation of the set-up. I used it to set up the Helicommand on my TRex 450.