This is the Traxxas TRX-4M Brushless System [6250].

The new brushless ECM offers all the same great features as the standard ECM, but with even more compatibility. The integrated lighting control module and receiver maintain all existing functionality with existing Pro Scalelight kits and works with both TQ and TQi transmitters. New field-oriented control (FOC) programming allows the ESC to monitor the motors position for ultra-precise control. The brushless ECM offers two servo output ports and two Pro Scale lighting ports and even uses the same battery connections and mounting bosses for true plug-and-play capability.

Brushless Power System Features:

Brushless outrunner motor

More torque and low speed control than conventional designs
3350 Kv
Laser-etched can
Includes 11-tooth pinion gear

Brushless ECM

Retains all standard ECM features including Pro Scale lighting controls
Field Oriented Control (FOC)
Compatible with 2s LiPo power
Works with both TQand TQitransmitters
Three drive modes:

Sport(100% FWD, 100% Brake, 100% REV)
Trail(100% FWD, 100% Brake, 100% REV, Trail-Tuned Brake on Neutral)
Crawl100% FWD, 100% Instant REV, 100% Brake on Neutral)

Same footprint and mounting points
True plug-and-play compatibility

The TRX-4M Brushless System is quick and easy to install. The ECM uses the same mounting bosses as the standard system with no modifications required. The system works with all existing TRX-4M parts and accessories including Pro Scale LED light kits and high/low two-speed transmissions. To get the most performance from your truck, consider the upgrades listed below for improved compatibility and toughness.

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