title_body: multi-protocol transmitters -- difference between stm32 4-in-1 and stm32 c2500 only ? [tx16s Vs. tx12]
upvoted_answer: 1&gt; The &quot;4 in 1 chip&quot; does handle more protocols than the CC2500. It has the CC2500, nRF24L01, A7105 and CYR all integrated in one package and allows you to bind with and use Flysky, Spektrum, HUBSAN, DSM2, DEVO, J6PRO, ESKY, HISKY, KN, V2X2 and ASSAN receivers which you won't be able to do with just the CC2500.
  2&gt; Spektrum is basically a brand of high end radios. (At least they are high end for me)