Radiomaster TX12 MKII ELRS EdgeTX Radio Controller | Compact FPV Transmitter | The FPV Project

The Radiomaster TX12 MKII is RadioMaster’s most popular compact FPV radio controller, updated with an internal ExpressLRS module, upgraded STM32F407 processor, precision hall-effect gimbals, and EdgeTX pre-installed from the factory. It delivers a full-featured open-source radio experience in a small, lightweight form factor — making it one of the best value FPV transmitters available for both beginners and experienced pilots.

Why choose the TX12 MKII ELRS?

The TX12 MKII hits a rare combination: it’s small enough to travel with comfortably, powerful enough to run EdgeTX with full lua scripting and model management, and comes with internal ELRS built in — no external module needed out of the box. The hall-effect gimbals provide precise, drift-free stick input with excellent centre-point consistency, and the upgraded STM32F407 processor keeps the radio responsive even with complex EdgeTX configurations. Pair it with our FPV accessories range for a complete setup.

Big Battery Bay

Allows for dual 18650 or dual 21700 Li-ion cells, or 2S Lipo up to 74×60×22mm.

Expresslrs BLE JOYSTICK MODE

Allows for Bluetooth connection to PCs, tablets and phones with BLUETOOTH function to play simulators and games.
* ELRS version only.

Radio Overview

TX12 MKII Quick Start Guide

Key features

Internal ExpressLRS (ELRS) module

Built-in 2.4GHz ELRS module transmitting at 20dBm — no external module required. ELRS delivers industry-leading link performance with ultra-low latency and long range, far outperforming older 2.4GHz protocols at the same price point.

EdgeTX pre-installed from factory

EdgeTX is the leading open-source RC transmitter firmware, actively developed with RadioMaster as a Gold Partner. The TX12 MKII ships with EdgeTX installed and configured — update anytime via USB with EdgeTX Buddy or EdgeTX Companion.

Upgraded STM32F407 processor

The MKII upgrades the main MCU from STM32F207 to STM32F407 — delivering faster processing for complex EdgeTX setups, more responsive OSD updates, and better USB communication stability.

Precision hall-effect gimbals

Hall-effect gimbals use magnetic sensing instead of mechanical potentiometers — providing better centre-point accuracy, improved temperature stability, and longer service life without the gradual drift that affects pot-based gimbals.

BLE Joystick Mode

The ELRS version includes Bluetooth joystick mode — pair wirelessly with your PC, tablet, or phone to fly simulators without a USB cable. Works with Velocidrone, Liftoff, and most major FPV simulation software.

JR-compatible external module bay

Standard JR module bay supports TBS Crossfire Micro TX, ImmersionRC Ghost, and other JR-format external RF modules — future-proofing the radio for any protocol you may want to run.

USB-C QC3.0 charging

Upgraded to USB-C with QC3.0 fast charging support — charges the battery faster than standard USB charging, using standard USB-C cables you already own.

Large battery bay

Supports dual 18650 or dual 21700 Li-ion cells, or a 2S LiPo up to 74×60×22mm. Battery cells are not included — purchase separately.

Specifications

What’s in the box

• 1x Radiomaster TX12 MKII ELRS radio controller
• 1x Antenna
• 1x USB-C cable
• 1x SD card
• 1x Quick start guide
• 1x Sticker

Recommended for

• Beginner FPV pilots wanting a capable, future-proof radio
• Experienced pilots wanting a compact travel radio
• ELRS ecosystem builds across all FPV drone classes
• Simulator use via BLE Joystick Mode

Build compatibility

The TX12 MKII ELRS works with any ELRS receiver across all drone classes — 3.5-inch cinewhoops, 5-inch freestyle, 7-inch long-range, and 10-inch builds. Browse our full range of flight controllers and build components for a complete setup.

Note: Battery cells (18650 or 21700) are not included. Confirm your mode preference before ordering — M2 (left-hand throttle) is standard for most pilots.