How to assemble an ARF RC aircraft step by step
A general ARF assembly workflow for many aircraft: dry fit, hinges, servo installation, power setup, CG, control checks and first-flight preparation.
GX12 Dual-Band Gemini-X Radio Controller (M2)
Prices are intentionally not displayed on the site.
Contact RC-MODEL for current availability, technical fit, compatible accessories and a formal quote.
GX12 Dual-Band Gemini-X Radio Controller (M2) is a RadioMaster product intended for pilots who need a capable programmable transmitter for aircraft, helicopters, FPV, gliders or surface models. This page presents the practical buying information in one place: compatibility, SKU, variants, radio protocol, use case and technical details.
The content is written for customer decision-making through RC-MODEL, without supplier prices or outbound purchase routes.
Key Advantages
- Organized for pilots who need a capable programmable transmitter for aircraft, helicopters, FPV, gliders or surface models.
- Part of the GX12 transmitter platform.
- RF/protocol context: ExpressLRS / ELRS, Gemini Xrossband, 2.4GHz, 915MHz / 868MHz, EdgeTX.
- Compatibility note: both 2.
- Multiple variants are documented for easier matching to the required setup.
- Includes local product imagery and structured specifications for customer comparison.
Core Specifications
- Product Code: HP0157.0094-BLK
- Product Family: GX12 transmitter platform
- Protocol / RF: ExpressLRS / ELRS, Gemini Xrossband, 2.4GHz, 915MHz / 868MHz, EdgeTX
- Channels: Max 16 channels (Receiver dependent)
- Compatibility: both 2
- Available Variants: ELRS / FCC; ELRS / LBT
- Battery: 7.4V 2-cell Lithium-Polymer / Two 3.7V 18650 Lithium-Ion cells / 21700 5000mAh Battery (batteries not included)
- Frequency: 2.400GHz and Sub-G 900MHz
- Weight: 573g
- Dual-Band Dual 1W Gemini Xrossband ExpressLRS Transmitters: Experience unmatched range and reliability with ExpressLRS Gemini Xrossband (Gem-X) dual-band transmission capabilities.
- Integrated Folding Dual-Band Antennas: Sleek design with foldable antennas for easy transport and storage; Compatible with both 2.4GHz and Sub-G 900MHz frequencies.
- 1000Hz Digital Gimbals with EdgeTX Sync: Achieve exceptional precision and responsiveness with high-frequency digital gimbals featuring EdgeTX sync.
- Folding Gimbal Sticks: Foldable gimbal sticks for convenient storage and transport.
Relevant RC Academy guides
Learn before you buy
These guides explain the setup, safety checks and accessory choices that usually matter for this product type.
Servo selection: torque, speed, gears and voltage
How to select servos for trainers, sport aircraft, large models, cars and boats without under-sizing a control surface.
How to balance an RC aircraft and find the correct CG
One of the most important setup guides: find the CG, install the flight battery, balance the aircraft and avoid nose-heavy or tail-heavy surprises.
Mandatory pre-flight checks for safer RC flying
A repeatable inspection routine for control direction, radio range, failsafe, battery, fasteners, propeller, CG and field readiness.
How to perform the first test flight of an RC aircraft
Ground checks, takeoff planning, trim passes, battery timing and first landing strategy for a new or repaired RC aircraft.
| Technical Specifications | |
| Manufacturer | RadioMaster |
| Brand | RadioMaster |
| Product Code | HP0157.0094-BLK |
| All Variant SKUs | HP0157.0094-BLK, HP0157.0094-BLK-LBT |
| Available Variants | ELRS / FCC; ELRS / LBT |
| Product Type | GX12 Radio |
| RadioMaster Collections | GX12 Radio |
| Product Family | GX12 transmitter platform |
| Application | pilots who need a capable programmable transmitter for aircraft, helicopters, FPV, gliders or surface models |
| Item | GX12 Radio |
| Gimbal Sticks | 3mm |
| Weight | 573g |
| Compatibility | both 2 |
| Protocol / RF | ExpressLRS / ELRS, Gemini Xrossband, 2.4GHz, 915MHz / 868MHz, EdgeTX |
| Frequency | 2.400GHz and Sub-G 900MHz |
| Internal RF | ELRS 2.4GHz / Sub-G 900MHz |
| Supported Protocols | Express-LRS |
| Channels | Max 16 channels (Receiver dependent) |
| Display | 128*64 Monochrome OLED display |
| Radio Firmware | EdgeTX (Transmitter) / ELRS (RF module) |
| Charging | 2S Smart Balance Charging |
| Internal Storage | 512MB of integrated high-speed flash storage-no need for TF cards! |
| Battery | 7.4V 2-cell Lithium-Polymer / Two 3.7V 18650 Lithium-Ion cells / 21700 5000mAh Battery (batteries not included) |
| Size | 183*148*78mm |
| Color | Black |
| Voltage Range | 6.6 - 8.4V DC |
| Gimbal | GX01 1000Hz, 3D Digital CNC Hall Effect Gimbal with folding sticks |
| Upgrade Method | USB / EdgeTX Companion PC software |
| Dual-Band Dual 1W Gemini Xrossband ExpressLRS Transmitters | Experience unmatched range and reliability with ExpressLRS Gemini Xrossband (Gem-X) dual-band transmission capabilities. |
| Integrated Folding Dual-Band Antennas | Sleek design with foldable antennas for easy transport and storage; Compatible with both 2.4GHz and Sub-G 900MHz frequencies. |
| 1000Hz Digital Gimbals with EdgeTX Sync | Achieve exceptional precision and responsiveness with high-frequency digital gimbals featuring EdgeTX sync. |
| Folding Gimbal Sticks | Foldable gimbal sticks for convenient storage and transport. |
| Removable Switch Panels | Customize your setup with our modular switch panels, allowing for easy switch changes to suit your preferences. |
| DIY SMA Ports | Enjoy flexibility in antenna installation with SMA port integration. |
| OLED Display | Crisp and clear OLED with high contrast display. |
| USB-C Connectivity | The GX12 features a single USB-C port that manages smart balance charging, SIM connectivity, firmware updates and direct access to the integrated high speed flash memory. |
| Integration of programmable 6-Position Switch | Individually programmable 6-position switches offer versatile control options tailored to your unique setup. |
| Programmable RGB Indicators on 6-Position and SA/SD Switches | Customizable RGB lights provide visual feedback on switch status. |
| Powerful Efficient Cooling System | With dual 1-watt transmitters, the GX12 boasts serious power, featuring an advanced cooling system to keep your radio cool even on the hottest days. |
| PCB Nano coating | Engineered for the Extremes! The GX12 is built to thrive in demanding environments. With thicker plastics and a hydrophobic PCB coating, this controller is designed to withstand hot, cold, dry, and humid conditions. Count on the GX12 to deliver, no matter whe... |
| Cooling Fan | Yes |
| Antenna | Dual folding 2.4GHz/ Sub-G 900MHz Omni directional |
| Current | 390mA - 1000mA (Depending on Rf output) |
| Connectivity | USB-C |
| External Module | Nano / Crossfire compatible |
| Memory | 512Mb Integrated Flash |
| RF | (Dual 1,000mW | Dual band XROSSBAND ELRS) |
Tags: RadioMaster, HP0157.0094-BLK, GX12 Radios, GX12 Radio, RC radio