RC4WD XR4 Radio | Manualzz INSTRUCTION MANUAL RCAWDO 4-CHANNEL COMPUTER SYSTEM 2.45HZ SYSTEM install the batteries (1) Remove the battery compartment cover. RC4WD XR4 4-Channel 2.4Ghz Transmitter & Receiver Radio. XR4 - A revolutionary advanced radio system at an unbelievable price. The only radio with 3rd and XR4 4-Channel 2.4Ghz Transmitter/Receiver Radio. PDF: Instruction Manual. XR3 3-Channel 2.4Ghz Transmitter/Receiver Radio. PDF: Instruction Manual Z-E0035 Twister High Torque Metal Gear Digital Servo. Z-E0004 540 Crawler Brushed Motor 45T. Optional Parts: Z-R0008 XR3 2.4Ghz 4-Channel XR4 2.4Ghz Blue