A great product, comes with no manual but very easy
to operate. I decided to buy this 4ch insted of the 6ch
because I wanted to use it in more than one plane and
wanted to be able to easily change the servo direction.
I put it on my EasyStar and the tx works great, no problems and the range is as far as the eye can see.
recomended, buy additional receiver and lipo tx buttery and you will be very happy !