I happened to buy a mode switch from hobbyking. Received it today. I installed the switch on Flysky 9X. Took about 15 mins to install. The switch worked well in the very first attempt. The switch was installed on CH8 for arduplane. The setting of PWM mid point for all the 6 touch buttons worked quite well. The set button on the bottom right is used for setting the PWM value of the button. quite simple and much easier to install as compared to installing a rotary type mode switch. The PCB quality is supereb. The three interface wires are of silicon. I think this is the most important add on a RC Tx. The processor does not bears any marking but most probably it s Atmel128. I liked the switch because it changes the PWM of just CH8. It is safer than changing the whole RC PPM signal using the PPM IN/OUT pins of the trainer port of Tx.