The RadioMaster GX15 MAX Radio Controller is designed for RC pilots who want a combination of precision control, powerful processing, premium hardware, and modern ExpressLRS technology.

Positioned as the premium model in the GX15 platform, the GX15 MAX is designed for RC airplanes, gliders, helicopters, and other traditional aircraft. It combines a 3.5-inch IPS touchscreen, CNC-machined Hall sensor gimbals, a high-performance STM32 H7 processor, dual 2.4GHz ExpressLRS Gemini technology, integrated antennas, and a customizable control layout.

With a retail price of $249.99 USD, the GX15 MAX is aimed at pilots looking for a more advanced radio controller with premium controls and extensive configuration options.

What Is the RadioMaster GX15 MAX?

The GX15 MAX is a full-size radio controller built around the RadioMaster GX15 platform.

RadioMaster describes it as a controller for pilots who demand precision and a premium feel, particularly those flying traditional aircraft such as airplanes, gliders, and helicopters.

The controller uses EdgeTX as its transmitter firmware and comes standard with 2.4GHz ExpressLRS. It supports up to 16 channels depending on the receiver being used.

The GX15 MAX is available in five colors:

Black
Transparent Charcoal
Red
Gold
Blue

Key Features of the GX15 MAX

1. 3.5-Inch IPS Touchscreen

One of the most noticeable features of the GX15 MAX is its top-mounted 3.5-inch IPS touchscreen.

The display has a resolution of 480 × 320 pixels, supports 262K colors, and reaches up to 600 nits brightness. This makes the display easier to see in outdoor environments.

The screen is positioned above the main controls rather than behind them. This allows pilots to keep an eye on important information such as:

Telemetry
Timers
Flight information
System information

The design is particularly useful because the controls do not obstruct the display while the pilot is operating the radio.

2. STM32 H7 High-Performance Processor

The GX15 MAX is powered by an STM32 H7 processor.

According to RadioMaster, the processor provides increased computing performance compared with previous generations. This contributes to a smoother EdgeTX experience, faster script execution, and near-instant model switching.

For pilots who frequently switch between different aircraft models or use more advanced EdgeTX functionality, processing performance can be an important part of the overall radio experience.

3. AG02 CNC Hall Sensor Gimbals

The GX15 MAX comes equipped with AG02 CNC aluminum Hall-effect gimbals.

These gimbals are designed to provide smooth operation, precise control, and long-term durability. RadioMaster also uses CNC aluminum buttons and a CNC aluminum scroll wheel to create a more premium physical interface.

For RC pilots, the gimbals are one of the most important parts of a transmitter because they directly affect how the aircraft responds to control inputs.

The GX15 MAX therefore focuses heavily on the physical control experience rather than simply adding features to the display.

4. Dual 2.4GHz ExpressLRS Gemini

Another major feature is the integrated dual 2.4GHz ExpressLRS Gemini system.

The GX15 MAX uses dual Semtech SX1281 transceivers and supports ultra-fast ExpressLRS update rates, including F1000 operation with compatible receiver systems.

The system is designed around low-latency control and reliable signal performance.

RadioMaster also positions the dual-transceiver configuration as providing:

Gemini redundancy
Polarization diversity
Reliable signal performance
A clean external design without bulky external antennas

The GX15 MAX uses dual integrated 2.4GHz antennas, with horizontal and vertical antenna orientations positioned behind the display.

5. Built-In Cooling System

High-performance electronics generate heat, particularly during demanding or extended use.

The GX15 MAX incorporates a low-noise cooling fan and aluminum heatsinks to help maintain stable operation.

This cooling system is designed for pilots who may use the controller for extended periods or in demanding conditions.

The fan is also designed to operate at low noise, helping maintain a more comfortable overall experience.

6. Smart Battery Management

The GX15 MAX includes an intelligent battery management system designed to optimize power usage and extend operating time.

The controller supports several battery configurations, including:

7.4V 2-cell LiPo
Two 3.7V 18650 Li-ion cells
21700 5000mAh battery

Batteries are not included with the controller.

7. Customizable Shoulder Switches

The GX15 MAX also gives pilots more flexibility over the physical control layout.

Its interchangeable shoulder switch modules allow users to configure the controller according to their preferences. The switches can also be replaced with momentary buttons.

This is particularly useful for experienced pilots who already have a preferred transmitter layout.

Instead of forcing every pilot to use exactly the same configuration, the GX15 MAX allows a degree of hardware customization.

8. Built-In Flash Storage and MicroSD Support

The GX15 MAX includes 512MB of built-in flash storage and supports external microSD storage.

This provides additional flexibility for managing models, scripts, firmware-related files, and other supported data.

The controller supports a 32GB FAT32 microSD card. RadioMaster notes that inserting a microSD card disables the onboard flash storage.

9. Built-In Gyroscope

The GX15 MAX includes a built-in motion sensor/gyroscope.

This enables additional control possibilities, including tilt-based inputs for:

Logical switches
Gimbal movement
Telemetry functions
Voice prompts

This gives pilots another way to interact with the radio without requiring additional hardware.

10. EdgeTX Firmware

The GX15 MAX uses EdgeTX transmitter firmware, with RadioMaster specifying version 2.12.0 or higher.

RadioMaster also identifies itself as an EdgeTX Gold Partner and says it has been involved in the development of the EdgeTX project.

For users already familiar with EdgeTX, this provides a familiar software environment with extensive configuration possibilities.

GX15 MAX Specifications

Specification	GX15 MAX
Product	GX15 MAX Radio Controller
Price	$249.99 USD
Frequency	2.400GHz
Internal RF	ExpressLRS 2.4GHz
Channels	Up to 16, receiver dependent
Firmware	EdgeTX 2.12.0 or higher
Processor	STM32 H7
Display	3.5-inch IPS touchscreen
Resolution	480 × 320
Display Brightness	Up to 600 nits
Built-in Storage	512MB
Cooling	Built-in fan
Motion Sensor	Yes
Connectivity	USB-C
Gimbals	AG02 CNC Hall sensor
Module Bay	JR-compatible
Dimensions	199 × 197 × 78mm
Weight	725g without battery
Colors	Black, Transparent Charcoal, Red, Gold, Blue

Specifications are based on the manufacturer's published product information.

What Comes in the Box?

The GX15 MAX package includes:

1 × GX15 MAX Radio Controller
1 × GX15 MAX Signature Carry Case
1 × 18650 Battery Tray
2 × Replacement Shoulder Panels
1 × Type-C Cable
1 × Screen Protector
1 × 1.5mm Hex Wrench
4 × Low Tension Gimbal Springs
2 × Gimbal Stick Set Screws
4 × 6mm Switch Delete Grommets
1 × Lanyard
1 × RadioMaster Sticker Set
1 × GX15 Manual
1 × Inventory Card

Who Is the GX15 MAX For?

The GX15 MAX is primarily designed for RC pilots who fly:

✈️ RC Airplanes
🛩️ Gliders
🚁 Helicopters
🛩️ Traditional Aircraft

RadioMaster specifically positions the GX15 MAX for pilots who want a premium control experience and advanced hardware.

It may be particularly interesting for experienced pilots who value:

Precision gimbals
A large touchscreen
ExpressLRS
EdgeTX
Customizable switches
Fast processing
Integrated antennas
Premium physical controls

GX15 MAX vs Standard GX15

RadioMaster also offers the standard GX15 Radio Controller.

The company describes the standard GX15 as providing the same core platform performance in a more accessible configuration, while the GX15 MAX adds premium materials, AG02 CNC gimbals, and refined controls.

For pilots deciding between the two, the GX15 MAX is positioned as the premium option within the GX15 family.

Final Thoughts

The RadioMaster GX15 MAX brings together many of the features that advanced RC pilots may be looking for in a modern transmitter.

Its combination of a 3.5-inch touchscreen, STM32 H7 processor, AG02 CNC Hall gimbals, dual 2.4GHz ExpressLRS Gemini, integrated antennas, EdgeTX, customizable switches, built-in cooling, and flexible battery support makes it a feature-rich radio controller.

At $249.99 USD, the GX15 MAX sits firmly in the premium segment of RadioMaster's lineup.

For RC pilots looking for a modern radio controller with an emphasis on precision, customization, and advanced control technology, the GX15 MAX is worth taking a closer look at.