This is the KO Propo EX-NEXT Black SP 2.4GHz Radio System with (2) KR-420XT Long Wire Receivers.

XT Advanced Mode
An all new control software and radio communication software of the EX-NEXT has been developed. World record communication response and High resolution control are installed.
"XT Advanced mode" that is the highest speed in EX-NEXT is about 3 times the speed of the EX-RR.
The performance far exceeds the conventional high-speed communication.

High-speed communication in the XT advanced mode improves the information density that will be sent to the receivers.
You will feel a "Fine and smooth maneuvering feeling" by unprecedented high-definition and high-resolution control when operating.

XT Telemetry mode
EX-NEXT supports "XT Telemetry mode" that uses 2-way communication. When "4S series servos" that support serial compatible are connected to the B/S port in the new receiver KR-420XT, you can use "REAL TIME ICS". So, you can easily change parameters of servos from the transmitter without accessing the car directly. Setting your car with more freedom and more detail without compromise.

Also, even using the XT Telemetry mode that is 2-way communication, the High-speed response is still faster thanthe EX-RR.

High speed supported by Serial servo.​
Currently mainstream servo control method is performed by PWM control. PWM control method uses pulse width to send position of servos output from receiver. Serial control method uses a digital signal value to send the position of the servo output. So, communication speed of the Serial control method will be significantly faster than a PWM control method, time ofthe servo’s action from your operation input is shorter. Operating feeling will be ultra high speed like operating the car directly.

EX-NEXT & KR-420XT support the use of HCS that was adopted from the RSx3, BSx3 series. Until now, it was necessary to change the receiver mode using the settingdevice, but with EX-NEXT this can be changed from the transmitter for each channel. HCS compatible servos are automatically change to HCS mode when the received signal is HCS. If you want use HCS, please connect servos to 1-4ch ofthe KR-420XT.
<Compatible Servo>　RSx3 / BSx3 / RSx4S / BSx4S Series

You can use different kinds of servos by changing the response mode to "Normal mode". So, you can use most current servos and ESC with EX-NEXT.

In this case, please connect to 1-4ch of the receiver.
*If you change the response mode of EX-NEXT from NORMAL to XT advanced mode in the radio settings, the maximum movement degrees of servos are limit to maximum about 42 degrees and will change. So, if you use NORMAL mode were commended setting to XT telemetry mode in the radio setting. In case of using an ESC, there is no chance of using over a travel limit, so there is no problem using with XT advanced mod

Note:
Can not use LCD expansion unit EXP-104
For use of LiFe or LiPo batteries the option battery stand unit is required
Not compatible with FHSS or DSSS KR-418FH, KR-415FHD, KR-210S receivers

Specifications:
Dimensions: 240.5 x163.0 x107.2mm (Does not include protrusions)
Weight: 551g (battery not included)
Power supply: AAA size dry battery x4,
Ni-MH battery x4,
Li-Fe battery (2cell 6.6V)*
Li-Po battery (2cell 7.4V)*
(Batteries are sold separately.)
Current: 200mA or less
Channel: PWM 4ch / Serial 8ID
*Maximum setting ID number of serial are different by each products.
Frequency: 2.4GHz
Radio Mode: XT
Model memory 50
Compatible receiver: KR-420XT, " MINI-Z EVO Receiver Unit EX-NEXT MC-8"

*If you use Li-fe, Li-po, you must use with our option unit (Battery stand Unit).
*Can not use LCD Xpansion unit EXP-104 series.
*Can not use FHSS or DSSS receiver. (KR-418FH KR-415FHD,KR-210S etc)
*The product photos on this site are prototypes, which may be different to production models.

Includes:
(1) EX-NEXT Black SP 2.4GHz Radio System
(2) KR-420XT Receiver (Long)
(1) Aluminum Steering Wheel
(1) Drop Down Extension
(1) Expert Grip Unit 2

Needed to Complete:
(4) AAA NiMH Batteries