BetaFPV ExpressLRS 2.4Ghz Micro TX Module


BetaFPV ExpressLRS 2.4Ghz Micro TX Module

BETAFPV Micro RF TX module is based on the ExpressLRS project, an open-source RC link for RC applications. ExpressLRS aims to achieve the best possible link performance in both speeds, latency, and range. This makes ExpressLRS one of the fastest RC links available while still offering long-range performance.

Now FULLY supported with the latest ExpressLRS 2.* firmware version!


  • DO NOT power up without the antenna installed. This WILL cause permanent damage!
  • DO NOT use 3S or above battery to power up the TX module via XT30 port. This WILL cause permanent damage!




  • Packet refresh rate: 25Hz/50Hz/100Hz/200Hz (915MHz/868MHz), 50Hz/150Hz/250Hz/500Hz (2.4GHz)
  • RF output power: 25mW/50mW/100mW/250mW/500mW (2.4GHz), 100mW/250mW/500mW (915MHz/868MHz)
  • Frequency bands (Micro RF Module 2.4G version): 2.4GHz ISM
  • Frequency bands (Micro RF Module 915MHz/868MHz version): 915MHz FCC/868MHz EU
  • Input voltage: 5V~12V
  • XT30 port: 5V~12V, recommend 2S(8.4V) battery, DO NOT support 3S(12.6V) or above 
  • USB port: Type-C


BETAFPV Micro RF TX module is compatible with radio transmitter which has the micro module bay (AKA JR/SLIM module bay, e.g. Frsky Taranis X9D、TBS Mambo).





Basic Configuration

ExpressLRS uses the Crossfire serial protocol (AKA CRSF protocol) to communicate between the radio transmitter and the TX module. So make sure your radio transmitter supports the CRSF serial protocol. We use the radio transmitter with the OpenTX system to show how to set up the CRSF protocol and LUA script. To set this up, in the OpenTX system, enter into model settings, and on the "MODEL SETUP" tab, turn off the "Internal RF". Next, enable "External RF" and select "CRSF" as the protocol.

ExpressLRS use the OpenTX LUA script to control the TX module, like bind or setup. With the LUA script, pilots could check, and set up some configurations of the Nano RF TX module. For more details, please check the Support Page.

  • Save the ELRS.lua script files onto the radio transmitter SD Card in the Scripts/Tools folder;
  • Long press the "SYS" button (for RadioMaster T16 or similar radios) or the "Menu" button (for Frsky Taranis X9D or similar radios) to access the Tools Menu where you can find ELRS script ready to run with only one click;
  • The below image show, the LUA script run successfully;

Bind & Output Power

The Micro RF TX module comes with officially major release V1.1.0 protocol and no Binding Phrase included. So please make sure the receiver works on officially major release V1.0.0~V1.1.0 protocol. And no Binding Phrase setted. Micro RF TX module could enter binding status via ELRS.lua script, as description in "LUA Script" chapter. Besides, using the button and OLED, move to the BIND position and long press the button. Then the RF module will enter binding status.

Note: The LED will NOT flash when entering binding status. The module will exit from binding status 5 seconds later auto. Short and consecutive press 3 times to bind.

Micro RF TX module could switch the output power via ELRS.lua script, as description in "LUA Script" chapter. Besides, using the button and OLED, move to the Output position. Long press the button could switch the output power.

Note: The RGB LED will NOT change according to the output power. When the output power is 250 mW or above, the fan will spin automatically. The Micro RF TX module does NOT support 1W or 2W output. When switching to this value, the system will move to 500mW automatically.


BETAFPV ELRS Micro TX module user manual download.

The USB port housing is 6.2*11mm and may not compatible with your own USB cables. So a spare USB data cable (Type-A to Type-C) is included in the package for all order since November 18.




Package Contents

  • 1 x BETAFPV ELRS Micro TX module
  • 1 x BETAFPV Moxon antenna
  • 1 x Micro TX module user manual
  • 1 x Spare USB data cable (Type-A to Type-C)


18.00 (cm)
10.00 (cm)
6.00 (cm)
Receiver Type: