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The "RPM Sensor" is used in the following:
The DX4S DSMR™ 4-Channel AVC™ surface radio system gives everyone from entry-level RC drivers to hardcore backyard bashers an impressive list of programming features plus the amazing stability of AVC (Active Vehicle Control™) technology.
Spektrum DX4R Pro 4Ch DSMR Racing System
3-channel integrated telemetry surface receiver