You can feel most fastest response by EX-NEXT and KR-420XT.
*The telemetry function can only use with our serial compatible products and receiver's power voltage.

KR-420XT is supported  'REAL TIME ICS" that is new serial communication to servos. It became to change setting data of servos by wire-less from transmitter in your hand. You can use  "REAL TIME ICS"  with connect to B/S port from BSx4-one10 Grasper2  that is supported serial communication.

There is only one B / S port, but you can connect two or more devices by change the device ID number and  using a branch cable. So, You can use "REAL TIME ICS" in the GP car or else category too.

EX-NEXT & KR_420XT are supported HCS that is adopted from RSx3 BSx3 series.?Until now, it was necessary to change the receiver mode using the setting device, but with EX-NEXT, it can be changed from the transmitter each channel.HCS compatible servo are automatically change to HCS mode when received signal was HCS. If you want use HCS, please connect to 1-4ch of KR-420XT.

Specifications:

• Dimentions:30.9×18.4×13.5mm
• Weight:5.8g
• Operation Voltage: 4.8~7.4V
• Frequency: 2.4GHz(XT)
• Number of Channel: PWM 4CH?Serial 8ID
• Black shild antenna
• Gold-plated terminals
• Telemetry compatible
• Serial control compatible
• HCS compatible
• Fail safe function equipped

[Compatible models]
EX-NEXT
*it is can not use with EX-LDT/EX-RR/EX-2.