Tekin’s RX4 Brushless Sensored ESC is designed to power your chassis past any obstacle. With massive power handling capabilities, a waterproof* design and all the customization features you’d expect from a Tekin ESC; the RX4 has you covered no matter the situation. Not only reliable, this ESC has a host of built in features like a High Voltage BEC, Drag Brake, Data Logging, Voltage Cutoffs for LiPos, HotWire 3.0 Bluetooth Connectivity and the ability to run either Brushed or Brushless motors. The RX4 defines versatility.

The RX4 Housing is a thick-walled, reinforced Hardbox design able to withstand the elements and rough environments that come with true Offroad adventuring.

Rocks, Dirt, Snow, Sand, Mud, Trail and Track; the RX4 is no-limits RC fun.


Controls: Forward/Brake/Reverse

Input Voltage: 2S-6S LiPo / 4-16S NiMH-NiCD

Motor Limit Brushless Mode: 2S -  5700kV 4-pole

                                                   3S -  3500kV 4-pole

                                                   4S -  2300kV 4-pole

                                                   5S -  1800kV 4-pole

                                                   6S -  1200kV 4-pole

Motor Limit Brushed Mode: No Limit

Max Current: 240amps per phase*

BEC: 6.0v / 7.4v @ 8amps

Dimensions: 1.6 x 2.0 x 1.4" / 40.6 x 50.8 x 35.5mm

Weight: 2.65oz / 75.5g


*per manufacturer spec

Bluetooth Wireless Mobile and USB PC Tuning with the HotWire 3.0
HardBox Waterproof Design *

Multi-Fin High Efficiency Heat Sink and Optional High RPM Cooling Fan
3rd Channel Input for On-The-Fly Drag Brake Adjustments <<setup>>

QuickTune™ One Touch Programming

Adjustable Torque Control **

Adjustable Throttle and Brake Frequencies **
HD High Voltage Programmable BEC **
HotWire™ Programming Port **
Data Logging Capability **
Sensor Checker

One-Touch Radio Calibration
On-Board Temperature Indicator

ESC Self Diagnostics with Error Codes
Fully Proportional Forward/Brake/Reverse

D2: Dual Drive Mode Technology

Brushless and Brushed Motor Drive

Sensored or Sensorless Operation

LiPo Safe with Custom Voltage Cutoffs**

Sensor Plug for Precise Commutation

HDAC: High Density Copper PCB's
Ultra-smooth and Precise Throttle and Braking Control


*Waterproof in sensorless operation only. Element Proof ESCs and Motors are specially designed to withstand water splashes and are not meant to be submerged. Included dielectric grease must be used on the sensor connections to protect them from shorting.



DB - Drag Brake (13 steps)

BS - Brake Strength (13 steps)

LM - Torque Limiter (7 steps)

NW - Neutral Width (13 steps)

TP - Timing Profiles 5 Preset - 2 Custom*

MT - Motor Type

Brushless Modes - FWD Only / FWD-REV / FWD-REV Delay / FWD-REV Delay REV Motor Direction

Brushed Modes - FWD Only / FWD-REV / FWD-REV Delay

VC - Voltage Cutoff : 2S, 3S, 4S, 5S, 6S, Custom**

**requires HotWire™ sold separately.


Hotwire App Shown on Google Pixel

Hotwire App Shown on Apple iPhone

Download the HotWire App on your Android or iOS device to program your Tekin Speed Control on the go.


Connect to iOS devices with the HotWire 3.0 via Bluetooth LE technology to fine tune your settings on the fly!


Connect to Android devices through USB connection with the HotWire 2.0 or take advantage of the HotWire 3.0 Bluetooth LE technology to wirelessly adjust your settings!


Mobile tuning access gives you the freedom to hit the track, road or trails and take your HotWire with you. Install multiple HotWires in multiple vehicles and connect them all through the HotWire App for easy access anytime, anywhere.






- Android 4.3 & UP (device must have BLE)

- iOS 8 & UP (iPhone 4S and iPad2 or newer)



- Android 3.1 & Up




Update ESC Firmware

HotWire shown on Windows 10

Some settings and features differ between ESC models

On board Data Logging with the HotWire brings you all the info you need to know about your last run! Record a few laps or a pull down the drag strip and review the data on a PC or Android device immediately afterward. Monitor ESC, battery and motor performance so you can get the most out of your system and keep your setup tuned perfectly!



Battery Ripple
ESC Temperature
Motor Temperature


Set a Sample Rate, view logs at multiple resolutions, customize the display and save data logs for comparing!

Drive where you want, whenever you want with the Tekin Element Proof products!

The RX4 and ROC412HD power our 18.3lb custom Dakar Rally Truck!

Check out the installation, soldering and setup of an RX4 and ROC412 system! Dominate the trails, no matter the weather!

The RX4 is more than just a crawler ESC. Check it out in action in our Pro-Line PRO MT 4x4!



TT2300 - RX4 ESC



TT1451 - HotWire 2.0
TT1452 - HotWire 3.0 BLE



TT3842 - RX4 Case Top



TT3806 - Tekin Power Switch

TT3808 - Receiver Plug 325mm

TT3809 - Sensor Cable 150mm

TT3810 - Sensor Cable 200mm

TT3811 - Sensor Cable 100mm

TT3813 - Sensor Cable 275mm

TT3825 - GEN3 HotWire Adaptor




TT3833 - RX4/RSX Fan Pack (2)





We guarantee our ESCs to be free from manufacturer defects for 180 days from date of purchase. All items are tested in a controlled environment prior to the packaging process to ensure you receive a top quality Tekin product. We strive to provide the highest grade professional components possible and we appreciate and treat every Tekin user as part of our family. We are RC enthusiasts designing and manufacturing quality products to give our fellow RC enthusiasts the best hobby experience possible.


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