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KO Propo EX-RR 4-Channel 2.4GHz FHSS Transmitter Radio System w/ KR-415FHD Receiver (VER.2.1)

USD 299.90 USD 327.00 (Save 8.3%)

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Tags: KO Propo Radio System - Pistol Grip

KO PROPO EX-RR 4-Channel 2.4GHz FHSS Transmitter Radio System w/ KR-415FHD Receiver #KO-80576


This is KO PROPO EX-RR 2.4GHz FHSS Transmitter Radio System w/ KR-415FHD Receiver.

The newly designed throttle unit has increased the direct feeling.

Renovating the form by lengthening the throttle trigger and operational angle. In order to not influence the operational angle, the distance to the finger from the angular sensor has created a more direct feeling while maintaining a compact and comfortable size. With the direct feeling of the throttle/brake reaction when moved, the increase of this linear feeling allows for a smoother and quicker reaction with input on the throttle and brake.



Spring Tension Adjustment

Trigger spring tension = personal preference. The new trigger unit provides a spring tension adjustment with a screw. This allows for a stronger or softer spring tension according to personal preference.

The long life period of the angle sensor’s smoothness does not change.The new angle sensor used has proven to give a precise signal and shown durability. Because the signal is very precise, delicate movements are very fluid. The durability of the new sensor has shown approximately an improvement of 100 times over the past sensor used. Small operation feeling of the fingertip translates into a smooth and linear output to an ESC and servo.

The soft spring which can be operated with a constant tension.The normal spring included in the extension unit has been modified. The previous spring used was a progressive spring becoming stiffer as the wheel angle increased, but the new softer spring give a linear stiffness as the wheel angle increases. Since the spring tension can be adjusted, you can set the spring tension to your personal preference.

Small diameter of the wheel / The operation feeling improves with the lightening of the wheel. The newly designed wheel is made from aluminum. Multiple run test were iterated and the best wheel diameter was chosen. Becoming a little smaller then previous wheels the reaction of the car operation has improved. The diameter of the aluminum wheel is 2mm smaller and the weight is the same as a plastic wheel. Therefore, it has the rigidity of aluminum but a light operation feeling.

Operation:FUNCTION>SYSTEM>CALC. This new function has been added to the calculator in the EX-2. [Put TYRE DIAMETER in the calculator, ROLLOUT( Car movement distant per one motor rotation ) is automatically calculated. This is useful for changing gearing in a DD car.

New Push Control Function for Direct drive car. Operation:THROTTLE>(PAGE2)>PUSH A motor that has a strong magnetic force will add a braking effect when the throttle is released and will make a car stall in the corner. Setting the amount of forward input to remain on the throttle as the trigger returns to neutral can be adjusted. This is effective for F1, WorldGT and 1/12 category of cars whose gear ratio is small.


  • Individual response settings for the steering and throttle.( Feel setting menu)
  • Display RF mode (FH-G/ FH-F /MzMHS G/MzMHS F)
  • 2 way setting point in the Steering Speed. (2WAY;TURN1/2、TURN POS RETURN1/2、RETURNPOS)
  • 3 way Setting point in the Throttle Speed. (3WAY; TURN L/M/H RETURN H/M/L、POS L>M/M>H)
  • Full acceleration settings. >THROTTLE CYCLE Menu(START TRIGGER POS、END TRIGGER POS)
  • Balance L/R added in the Steering override.
  • Add User timer. >CONFIG Menu
  • 40 model memory.


  • Dimensions:230×163×107mm
  • Weight:536g (not included battery)
  • Battery: RO3/AAA/UM4 battery x 4
  • Current: 150mA
  • Using time: 4 or 5 hours( with alkaline battery)
  • Channels:4 channels #Frequency:2.4GHz(FHSS)
  • Model memory: 40
  • Compatible receivers: KR-413FH,KR-241FH,KR-211FH,KR-212FHG.
  • *If you use Li-fe, Li-po, you must use with our option unit (Battery stand Unit).
  • Dimensions:30 x 23 x 12.8mm
  • Weight:8.0g
  • Operation Voltage:4.8 to 7.4V
  • Dual Antenna FHSS. DDS compatible.
  • Number of channels: 4( compatible with HCS and Normal)
  • Shield Wire antenna
  • Gold Plated header pins
  • Compatible for HCS.


  • KO PROPO EX-RR 2.4GHz FHSS Transmitter Radio System
    • Master Unit EX-RR (1pc)
    • LCD Xpansion Unit EX-104S (1pc)
    • Aluminum Steering Wheel 3 (1pc)
    • Drop down Extension Unit(Included soft spring) (1pc)
    • Expert Grip Unit2 (right) (1pc)
    • Normal stand unit(1pc)
  • Receiver: KR-415FHD(1pc)
  • Other: RX mode selector (1pc)
Rcmart Description
Transmitter Type Pistol Grip

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