I'm thinking about getting a different transmitter with telemetry built in mainly so I can stop setting the low voltage alarm on my quadcopter and let the TX do it for me. I'm interested in the low voltage and an altimeter. Other monitors would be nice but that is all I really want to start with. I have a 9X and 9XR now but I want the TX to have the ability built in because I don't want to modify any of my hardware (resell reasons). I'm not really sure where to start looking. My LHS started selling the Spektrum DX6 and it looks like it can do those things but I can't find specifics on how it all works. I'm wondering what other people are using and just trying to figure out my options and what I should be looking for. Any thoughts? Other forums where this is discussed?