Radiomaster TX15 MAX – configurable ELRS radio for FPV and RC models

Radiomaster TX15 MAX Radio Controller (M2) ELRS / Red combines ExpressLRS radio communication and EdgeTX firmware for controlling FPV drones and other RC models equipped with a compatible receiver. Mode 2 places throttle control on the left stick. This MAX version features red anodized accents, AG02 CNC aluminum gimbals, a touchscreen and model-specific configuration options. It suits users who want to adapt channels, switches and radio functions to their models.

Built-in ExpressLRS and an expandable radio system

An internal transceiver based on Semtech LR1121 supports ExpressLRS on either 2.4 GHz or the sub-GHz 900 MHz band. These are selectable bands; a model’s receiver must match the frequency band and protocol in use. Up to 16 channels are supported, with the actual available channel count depending on the receiver. A JR-compatible module bay on the rear accepts additional external transmitter modules.

Transmit power is adjustable, and RadioMaster specifies antenna gain of 2 dB. A folding antenna makes storage and transport more convenient. A fan and aluminum heat sink cool the internal radio system.

AG02 gimbals and customizable controls

This MAX version uses AG02 CNC-machined aluminum gimbals with Hall sensors. Travel can be adjusted on both vertical and horizontal axes, and stick ends use an M4 thread. Aluminum buttons and a scroll wheel complement a carbon-fiber-look housing.

Shoulder buttons can be replaced with the included short switch assemblies, choosing between a two-position latching switch and a momentary switch. RGB light rings around the gimbals support Lua-controlled lighting effects. An integrated ICM-42607-C motion sensor provides TiltX and TiltY functions, allowing radio tilt to be assigned to actions such as switching, camera positioning or telemetry callouts.

Touchscreen, EdgeTX and storage

A 3.5-inch IPS touchscreen offers 480 × 320 resolution and a manufacturer-specified brightness of 600 nits. An STM32 H7 processor runs EdgeTX, with support for model configurations and Lua scripts. Internal RF module firmware is ExpressLRS. USB-C supports simulator connectivity and firmware updates using the UF2 method.

Built-in flash stores models, scripts, sounds and themes. Alternatively, a separately purchased 32 GB FAT32 microSD card can be used. Inserting a card disables onboard flash, so these storage options do not operate simultaneously. RadioMaster reserves the built-in microphone for future feature expansion.

Power, dimensions and included equipment

Operating voltage is 6.6–8.4 V DC, with current consumption of 875 mA at maximum transmit power. Power options include a 7.4 V two-cell LiPo battery or two 3.7 V 18650 Li-ion cells; RadioMaster also lists a compatible 21700 5000 mAh battery option. Batteries are not included. USB-C charging and a battery balancing circuit are built in.

Radiomaster TX15 MAX measures 178 × 168 × 81 mm and weighs 672 g without a battery. Included equipment comprises a Signature carry case, an 18650 battery tray, a USB-C cable, a screen protector and accessories for customizing switches and gimbals. Operation also requires batteries, a receiver compatible with the model and a correctly configured radio link.

See our full range of FPV controllers here.