FSC-BP409 Bluetooth 5.3 LE Audio USB Dongle Transmitter Adapter with Whip Antenna


The Feasycom FSC-BP409 is a Bluetooth audio transmitter that supports both Bluetooth Classic and LE Audio. It is compliant with Bluetooth 5.3 and equipped with a USB 2.0 interface. It can be used on Windows, Linux, and iOS systems without the need for drivers. When connected, it will be recognized as a composite device consisting of a USB audio input/output device and a USB virtual serial port. The device can be configured for basic functionality through button controls or for advanced functionality through the USB virtual serial port. The USB device is named FSC-BP409. The LE Audio feature of the Bluetooth adapter can operate in two modes: Broadcast Isochronous Stream (BIS) and Connected Isochronous Stream (CIS).

BIS is a unidirectional communication protocol that allows one or more audio streams to be broadcasted from the source device to an unlimited number of receivers that are not connected to the source. The device acts as a gateway, receiving audio data from an external source via USB and forwarding it to multiple LE Audio headphones, with no specific limit on the number of headphones supported.

CIS is a bidirectional communication protocol that allows independent, connected audio streams to be sent from the source device to one or more receivers. The FSC-BP409 can act as a gateway, simultaneously transmitting audio data through both the left and right ISO channels, enabling synchronized stereo playback.


  • Supports Bluetooth 5.3, and backwards compatible with Bluetooth 5.2/5.1/5.0/4.0/3.0/2.1/2.0
  • Driverless support for Windows/Linux/iOS systems
  • Supports LE Audio, HFP, and A2DP protocols, etc.
  • Supports simultaneous operation of Bluetooth Classic and LE Audio
  • Can be used with Bluetooth speakers, Bluetooth headphones, mobile phones, and tablets, etc.
  • LE Audio operates in BIS mode, supports multiple LE Audio headphones without specific quantity limitation
  • Maximum transmission distance up to 100 meters
  • Ultra-low latency of 20ms


  • Bluetooth Speakers
  • Bluetooth Headphones

Packing List

  • FSC-BP409 × 1
  • Product manual × 1
  • Warranty card × 1


USB Bluetooth Adapter FSC-BP409
Chipset nRF5340 + CSR8811A + PA
Bluetooth Version Bluetooth 5.3
Frequency 2.4 GHz
Transmission Speed 2 Mbps
Transmission Power +20 dBm
Transmission Distance Up to 100 meters
Antenna Built-in dual antenna
Power Supply USB
Supply Voltage 5V
Interface USB 2.0 Type-A male
Color Black
Protocol LE Audio, HFP, A2DP
System Compatibility Win7/8/10/11
Device Name FSC-BP409
Operating Temperature -40 ℃ to +85 ℃
Storage Temperature -40 ℃ to +85 ℃
Indicator Light Red, green and blue
Button Single button

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