Superior Anti-Interference- With pseudo random FHSS algorithm, the DUMBORC X4 2.4ghz RC Radio Transmitter has extraordinary anti-interference ability, and control distance up to 1640 feet (500 meters). It has 3ms Response Time and the most sensitive steering on the market. Go and enjoy the freest RC experience! Smart Mix Control & Throttle Speed Limit- Channel 1 and channel 2 can be mixed control and customized according to your DIY needs, channel 3 and channel 4 can be used for lights/winch (just need to connect additional switch board). The DUMBORC X4 remote controller with Unique Throttle Speed Limit Adjustment Function is suitable for beginners and kids to practice in a safe speed!