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Compact black ABS box with 1.8 inch LCD screen and two antennas

Ainostone AS0409-BLK-US2 Bluetooth 5.3 Transmitter Receiver

SKU CH-ZAMZ-DVCSC

Bluetooth 5.3 transmitter-receiver with dual antennas streams TV audio to two headphones or adds wireless input to wired speakers via optical, RCA or aux

  • Sales unit1
  • Cabinet materialAcrylonitrile Butadiene Styrene (ABS)
  • Remote controllerPush button
  • Size and weight4.57 in × 1.53 in × 5.43 in
  • Product colorBlack
  • Key featuresPush button, false, 1 year, 2BC49-C77, Acrylonitrile Butadie
  • Bluetooth 5.3 gives stable wireless audio up to 49 ft
  • Dual antenna design extends range for reliable whole-room coverage
  • Connect two headphones simultaneously for shared listening
  • 8 in LCD screen shows pairing status and device info
  • Aux, RCA and optical ports fit 99 % of TVs and stereos

What It Is

The Ainostone AS0409-BLK-US2 is a 3-in-1 Bluetooth 5.3 audio adapter that adds wireless capability to non-Bluetooth TVs, PCs and stereo systems. It operates as a transmitter to send TV audio to headphones, a receiver to stream phone audio to wired speakers, or a bypass for existing setups. The ABS cabinet measures 4.57 in x 1.53 in x 5.43 in and includes a 1.8 inch LCD screen for visible pairing status. It is powered by an external supply with no internal battery.

The Deciding Spec

Dual-link support lets two Bluetooth headphones listen simultaneously from a single source, a feature absent on basic adapters. The unit defaults to optical input but gives priority to AUX when both are connected; RCA cannot be used alongside optical at all. It does not work with certain amplifiers such as Yamaha models or audio converters. TVs must be set to PCM output over optical for audio to pass through.

Install & Common Issues

Plug the adapter into mains power, select TX, RX or BYPASS mode, and pair headphones within one metre during initial setup. The LCD confirms the active input and connection state. Frequent problems include no sound over optical until PCM is enabled on the TV, unstable links that often clear after a factory reset, and the hard rule that RCA and optical cables cannot stay plugged in together.

How it compares

Measured against everything we stock in Wi-Fi & Bluetooth Audio Devices, at today’s prices. Recalculated every night.

Price $50.99
Cheaper than about 58% of the 297 comparable items (median $63.99).

Specifications

Product
Brand nameAinostone
Product lineAS0409-BLK-US2
Model nameAS0409-BLK-US2
Product colorBlack
Ports & slots
Connection typesNo
Power
Power supplyNo
Size & build
Cabinet materialAcrylonitrile Butadiene Styrene (ABS)
Size and weight4.57 in × 1.53 in × 5.43 in
In the box
Sales unit1
More details
Remote controllerPush button

Questions about this item

What does the 5.3 in Bluetooth 5.3 mean for everyday use?

Bluetooth 5.3 gives a more stable link and lower latency, so two pairs of headphones stay in sync with the TV without noticeable lip-sync drift.

Which audio inputs can I use at the same time on this adapter?

Optical is the default; plugging in AUX overrides optical automatically, but RCA cannot share the port with optical — unplug one before using the other.

How much space does the 1.8 inch LCD unit need on a shelf?

The chassis measures 4.57 in wide, 1.53 in deep and 5.43 in high, so allow a little clearance around those dimensions for cables and the two antennas.

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