RadioMaster MT12 4-in-1 Surface Radio Controller with R85C Receiver - Multi-Protocol RC Transmitter

The RadioMaster MT12 4-in-1 Surface Radio Controller sets a new open-source standard for surface enthusiasts, replacing a tray full of restrictive, brand-specific transmitters with a single, highly customizable system hub.

First-Ever EdgeTX Open-Source Surface Operating System :

Unlike traditional, locked-down surface radios that offer restrictive programming menus, the MT12 is driven by the powerful open-source EdgeTX operating system. This software architecture gives users complete freedom to program complex channel mixing schemes, custom voice alerts, adjustable trim increments, and unlimited model memory management, all viewable via a crisp, backlit 128x64 LCD display interface.

Integrated 4-in-1 Multi-Protocol RF Module :

Forget about changing modules or buying separate radios for different models. The internal 4-in-1 RF chip features pre-tuned hardware configurations compatible with a huge range of popular multi-protocol systems, including FrSky, Futaba, Flysky, DSM/DSMX, and many more. This allows surface pilots to bind the MT12 straight to their entire collection of standard crawler, drift, racing, and marine scale assets.

High-Precision Hall Effect Control Mechanics :

To ensure lightning-fast command response loops and bulletproof reliability, the MT12 trigger and steering wheel mechanisms utilize non-contact Hall Effect position sensors. Completely eliminating the friction wear, centering drift, and dirty contact dead-zones common with older analog potentiometers, this system delivers exceptionally smooth, sub-millimeter control tracking over millions of cycles.

Robust ER85C 5-Channel Receiver Included :

This high-value bundle includes the matching RadioMaster R85C receiver, an agile 5-channel PWM unit configured to interface with your ESCs, steering servos, shift servos, and auxiliary setups. Supporting robust bidirectional telemetry pipelines, it relays vital real-time diagnostics—such as active receiver signal strength (RSSI) and operating voltage metrics—back to your controller display screen.

Specification :

• Brand: RadioMaster

• Product Model Name: MT12 Surface Radio Controller System

• Operating Software Core: EdgeTX Pre-installed

• Internal RF Framework: 4-in-1 Multi-Protocol Module (CC2500, NRF24L01, A7105, CYRF6936)

• Frequency Tuning Domain: 2.4GHz

• Included Receiver Bundle: RadioMaster R85C (5-Channel PWM)

• Display Interface Block: 128x64 Mono Backlit LCD Screen

• Control Sensors Array: Precision Non-Contact Hall Effect Steering and Trigger Assembly

• Hardware Expansion Support: External Micro RF Module Expansion Bay

• Working Supply Voltage Bounds: DC 6.6V to 8.4V

• Battery Compartment Sizing: Accommodates 2x 18650 Li-Ion Cells or 2S LiPo Packs

• Charging Infrastructure: Integrated USB-C Balanced Charging Interface

• Tactile Upgrades: Dual-Position Contoured Hand Grips and Adjusting Lanyard Loops

• Physical Proportions Size: 177.8mm x 118.4mm x 207.8mm

• Net Hardware Mass Weight: 480g

Frequently Asked Questions :

Q1: Can I operate standard marine RC hobby boats with this 4-in-1 MT12 transmitter system?Ans: Yes, absolutely. The internal 4-in-1 RF module is highly capable of driving model boats, scales, and amphibious assets. Because it operates on the 2.4GHz spectrum, ensure your receiver antenna arrays are positioned vertically well clear of internal water shielding hulls to optimize signal propagation and prevent reflection dropouts.

Q2: What type of battery option is best to power the MT12 radio handle over long track sessions?Ans: The built-in battery tray is custom-optimized to hold two standard 18650 button-top 3.7V Lithium-Ion batteries. Alternatively, you can use a compact 2S LiPo pack with a matching JST-XH balance plug. The integrated USB-C port handles balanced charging internally, so you don't need to remove the cells to top them up.

Q3: How many independent channels can I actively mix using this transmitter setup?Ans: While the included R85C receiver provides 5 physical PWM outputs for your vehicle's components, the MT12 transmitter core can process up to 16 independent channels internally. By adding a larger external module to the rear micro expansion bay, you can comfortably map complex functions on multi-axle trucks, heavy-construction loaders, and complex scale models.

Q4: Can I adjust the mechanical tension of the steering wheel and throttle trigger assembly?Ans: Yes. RadioMaster incorporates accessible internal adjustment screw routes right into the chassis walls. By using the included hex driver tool, you can customize the spring return tension of the steering wheel and throttle trigger to suit your personal driving preferences.