The EX-NEXT protocol used in the KR-420XT allows the user to chose from differnet RF modes, either XT advanced mode, which is fastest response in the world by one way communications or 'XT telemetry mode' which is supported telemetry (two ways communication).The KR-420XT supports 'REAL TIME ICS", a new serial communication to servos. It allows the user to change setting data of servos wirelessly from transmitter in their hand. You can use "REAL TIME ICS" when connected to the B/S port and the servo supports serial communication, i.e. the BSx4-one10 Grasper2. While there is only one B / S port, you can connect two or more devices by changing the device ID number and using a branch cable. This allows the user to use "REAL TIME ICS" in a GP car or other categories as well.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 for each channel. HCS compatible servos are automatically change to HCS mode when received signal is HCS. If you want use HCS, please connect to 1-4ch of KR-420XT. *The telemetry function can only use with our serial compatible products and receiver's power voltage.Specifications:Dimentions:30.9x18.4x13.5mmWeight:5.8gOperation Voltage: 4.8~7.4VFrequency: 2.4GHz(XT)Number of Channel: PWM 4CH Serial 8IDBlack shielded antennaGold-plated terminalsTelemetry compatibleSerial control compatibleHCS compatibleFail safe function equipped
