the module uses it's own 9vdc battery.
the unit only gives max speed and RPM not how fast it got there.
It can not be used with dsm II (If you have a Dx3r you have to use the older pro sr-3001 rec module which is regular dsm1).
Not sure of the power drain.

take a look at the spektrum site and look at the manual for telemetry


Pass you soon