there should have been a bind plug(pairing cord) in with the manual.

the flysky is exactly the same as what redcat has.

i have had a couple of the Rx's just quit working right, while others worked great.

the flysky is cheaper than buying a replacment redcat dsm2 unit.

you can also buy just the rx from hobbypartz. but its half the cost and i say its worth it just to get the radio and rx. plus they will come bound so all you have to do is swap out the rx in your caldera and recalibrate the ESC to the new radio.

flysky also has a radio GT3b that is fancier than the redcat, also 2.4, uses the same rx and has many more features. look that one up. many have it and like it.