I also have the Spektrum telemetry module and I basically agree with what dmx2 stated. It's ok if you already have a spektrum (I got all the functions to work, including the rpm) but it is a little on the expensive side. Regarding the 6 screws to change the battery issue that dmx2 mentioned. What I did was add a rechargable 300mah 9 volt battery, I then connected a 9volt tab that is accessable from the outside. So I just attach the 9volt tab to my charger, once the battery is charged I unplug the tab and I am ready to go.