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Futaba 4PX 4-CH Telemetry Radio System R304SB 2x Receiver

Price: $79


This is the Futaba 4PX 4-Channel 2.4GHz T-FHSS Radio System, with an included R304SB Receiver. The 4PX is the most cutting-edge 4-channel radio in the Futaba fleet. The 4PX is 30% faster and 0.5 oz. (15 g) lighter than the 4PKS-R, for ultimate response and comfort. It’s fully stocked with all the features today’s drivers want — and then some. 

At the heart of the 4PX is a full-color TFT (Thin Film Transistor) display that's easy to read in any light condition. This large, 3.5" (89 mm) LCD has intuitive menus and clearly labeled graphics for hassle-free operation. Racers can even monitor lap times and battery voltage in real time without having to scroll through multiple menus. 

The 4PX also includes a synthesized voice for telemetry data, so drivers can hear the latest updates through the built-in speaker or headphones (sold separately). A large, assignable button on the bottom of the transmitter lets users activate key features instantly. 

Compatibility with T-FHSS, S-FHSS and FASST protocols gives drivers the freedom to use the 4PX with their favorite Futaba 2.4GHz receivers. Durable, long-lasting potentiometers result in improved, precise calibration; insert a micro memory card (sold separately) to update software and transfer models from one 4PX to another. 

Other highlights include multiple crawler functions, two trigger choices and a steering wheel with drop-down option – all proven features by drivers all over the world. Of course, they only represent a small part of everything the 4PX has to offer. See the features below for a full list of what the 4PX has to offer. 


4PX 2.4Ghz  Telemetry Radio (with battery)
R304SB 4 Channel SBUS Receiver (2 receiver)
Instruction Manual


  • 30% faster and 0.5 oz (15 g) lighter than the 4PKS-R
  • 3.5" (89 mm) QVGA (Quarter Video Graphics Array) TFT (Thin Film Transistor) color LCD screen makes navigation and programming fast and simple
  • Three grip choices (two are optional)
  • Durable, long-life wheel potentiometers
  • Two durable, throttle trigger options with tension adjustments
  • Large, assignable switch that can be touched by a driver's body is located on the bottom edge of the transmitter
  • Low steering wheel position with drop-down option
  • Steering wheel can be switched for left-handed drivers
  • Trigger unit can be adjusted forward or backward by 7 mm
  • Compatible with these T-FHSS, S-FHSS and FASST receivers: R304SB, R304SB-E, R614FS, R614FF-E, R2104GF, R204GF-E, R203GF and others as they are developed
  • 31 telemetry sensor slots available (sensors sold separately)
  • Synthesized voice for telemetry data
  • Multiple crawler functions — including 4WS mixing and Dual ESC mixing
  • Comfortable feel/balance
  • Internal aluminum frame
  • 5 programmable mixes
  • 40-model memory
  • Steering mixer
  • Brake mixer
  • Gyro mixer
  • CPS (Channel Power Switch) mixer
  • Tilt mixer
  • Adjustable dual-compound steering wheel can be switched around for a different feel
  • Multi-function jog switch
  • Grip with built-in vibration
  • Built-in S.Bus servo/Futaba ESC/telemetry sensor programmers.
  • Mechanical ATL
  • 32° and 34° wheel adapters
  • "Telemetry Disabled" LED indicator
  • Earphone jack
  • Battery charging jack
  • Built-in speaker
  • Adjustable rotating antenna
  • Compatible with 2S LiFe batteries, NiMHs, dry cells and other battery options. Lasts approximately 10 hours in T-FHSS mode and approximately 6 hours in FASST mode using a LiFe battery
  • Micro memory card slot
  • Free user-updateable software
  • Push-button power switch with auto-off function
  • Clock and voltage meter
  • Neck strap holder
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