hi
some latest servos are "hi-volt" capable of running direct from 2 cell lipos (8.4v) fully charged
more normally servos are powered from the receiver itself at around 5- 6 volts
in electric set ups, the rx is powered from the ESC (speed controller) in nitro set ups a separate battery pack supplies the rx again usually around 5-6 volts
"digital servos" are capable of handling the 2.4 ghz technology
hope this helps
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