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Includes a FREE 4-pin micro to 3-pin JR servo plug cable when bought from Flex Innovations!



This receiver is compatible for use with the Aura line of Advanced Flight Control Systems on firmware V1.14 or newer.
The SRXL2 Protocol allows editing of many Aura parameters on the transmitter screen using the Aura Telemetry Tune feature. Compatible transmitter also required.
Recommended for Aircraft up to 90 glow size or equivalent. Works with all Flex SPNP aircraft except for the FlexJet TV (Thrust Vector) and F-100D which require additional working servo ports in the receiver.

Click Here for Wiki Content on SRXL2 use including a Video from Flite Test

This adapter Cable is included for FREE when the receiver is bought from Flex Innovations. It is also available for separate purchase.


The SPM4651T DSMX SRXL2 Serial Micro Receiver takes the original SPM4649T receiver and adds more value, functionality, longer control and telemetry link range. The SPM4651T uses our feature-rich SRXL2 protocol to give pilots a blazing fast serial data connection with up to 20 channels. SRXL2 is a powerful and open source communication protocol developed by Spektrum. It greatly improves bi-directional communication between the radio system and flight controller for added telemetry functionality and flight control configuration right from the pilots Spektrum Transmitter*, all over one signal wire.

The SPM4651T is small, lightweight, and ideal for Heli, Multi-Rotor and FPV Enthusiasts. It also features a simple bind button so pilots no longer need to carry a separate receiver or bind plug to bind. Dual antennas provide receiver diversity for solid signal and the long coax antennas help to provide maximum signal strength in all orientations for challenging installations where carbon fiber, metal and batteries shield the antenna. And with Spektrum DSMX 2.4GHz RF protocol the Spektrum SRXL2 Serial Telemetry Receiver provides remarkable range and interference free performance.

Key Features

  • SRXL2 Technology
  • Low Noise Amplifier – Helps Reduce Interference and Produce Extended Control Link Range
  • Small, Lightweight and Perfect for Heli, Multi-Rotor and FPV Enthusiasts
  • Wide Voltage Input Range (3.3v -8.4v)
  • Full Range Telemetry
  • Dual Diversity Antennas
  • Bind Button for Easy Binding – No Plug Required
    • Provided directly from receiver (per Spektrum)
      • Flight log data
      • Battery voltage
      • RPM
      • Lap Timer
    • Provided by external device e.g.: Flight Controller (per Spektrum and as available)
      • Flight log if using more than 1 receiver
      • Battery voltage
      • RPM
      • Lap Timer
      • Current draw and total mAh consumption
      • Temperature
      • All other data the FC can send that we support such as GPS, accelerometer date, ESC data, etc…



Antenna Length: 3.9″ (100mm)
Band: 2.4GHz
Bind Method: Bind Button
Channels: 20
Fail Safe No
Governor No
Height: 0.31″ (7.8mm)
Input Voltage: 3.3 – 8.4V
Length: 1.1″ (28.8mm)
Modulation: DSMX
Number of Receivers: One
Range: Full
Telemetry: Integrated
Type: Serial Telemetry Receiver
Water-Resistant: No
Weight: 0.14oz (4g) including antennas
Width: 0.71″ (18mm)