The EX-1 UR can be used with up to four channels for almost all of your land based R/C uses. Third and fourth channel monitoring are also available. The KR-408S is a four channel micro receiver using KO's Direct Sequence Spread Spectrum 2.4GHz system and features a coaxial antenna wire for better range and noise filtering. This receiver is compatible with the RF-901S/RF-902S modules and the EX-5 UR.
Steering Functions: Travel / Balance / Speed (12Way) / Curve / Center Trim / Sub Trim / Trim Rate / Reverse / Steering Monitor / Quick Steering. Throttle Functions: High Point / Brake / Curve / Punch / Speed (13Way) / Acceleration / Active Brake System (ABS) / Preset / Automatic Start / Sub Trim / Trim Rate / Reverse / Throttle Monitor / Quick Throttle. Timer Functions: Lap Timer / Down Timer / Alarm / Pre-alarm / Lap Navigation / Operation Timer / Stop Watch. Other Functions: Auto Display / Idle Up / Position Display / Direct Set / Elec trim / Digital Grip Dial / Battery Alarm / LCD Contrast / LCD Back Light / 30 Model Memory / Model Name / Model Select / Model Copy / Memory Recall / Memory Restore / Memory Reset / Channel Select (for use of channel 4) / Beeper Pitch Shift / Adjust Volume / Set Up / EEP ROM. 3CH Monitor / Configuration of 3CH.4CH Monitor / Configuration of 4CH. Receiver Specifications: Size: 28x18.3x18.5mm Weight: 7.5g Operating Voltage: 4.8V-7.4V Fail Safe Function: Yes Channels: 4 Channel System.