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Small black plastic Bluetooth 5.0 audio dongle with 3.5 mm jack and mode switch

Ruth's sister

Ruth's sister KN321 Bluetooth 5.0 Transmitter Receiver Adapter

SKU CH-N1V7-ZYHWJ

Bluetooth 5.0 adapter transmits audio from non-Bluetooth devices to headphones or receives streams from phones to wired speakers via 3.5 mm connections

  • Bluetooth 5.0 dual-mode transmitter and receiver
  • 5 mm audio jack connects wired speakers or headphones
  • Switch instantly between streaming to and from Bluetooth devices
  • Includes 3.5 mm and 3.5 mm-to-2RCA cables for wide compatibility
  • Mini ABS housing slips into any bag for portable use

What the adapter does

The Ruth's sister KN321 is a Bluetooth 5.0 transmitter and receiver that adds wireless audio to equipment without built-in Bluetooth. In transmitter mode it sends sound from a TV, stereo or CD player to Bluetooth headphones or speakers. In receiver mode it streams audio from a phone, tablet or computer to wired speakers or headphones. A slide switch changes the operating mode instantly.

Who it suits and who it does not

It suits listeners who want to make a single non-Bluetooth source wireless or add Bluetooth input to one wired system. The 3.5 mm and 3.5 mm-to-2RCA cables cover common analogue connections. Buyers who need aptX, AAC or other advanced codecs will not find them here, and the adapter does not support memory-card playback or Wi-Fi streaming.

Behaviour during extended use

Bluetooth 5.0 maintains a stable link for long listening sessions without the drop-outs that can appear in short bursts. The compact ABS body stays cool during continuous operation because the circuitry draws very little power. No charging or battery management is required while the unit is connected through the included cables.

How it compares

Measured against everything we stock in Worldwide Power Cords, at today’s prices. Recalculated every night.

Price $7.99
Cheaper than about 80% of the 1,208 comparable items (median $9.99).

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Specifications

No published specifications for this item yet.

Questions about this item

Do I need a 3.5 mm audio port on my TV to use the KN321 in transmitter mode?

Yes, the adapter connects through its 3.5 mm interface and the box includes a 3.5 mm cable plus a 3.5 mm to 2RCA cable for older stereo systems.

Will the KN321 work with my existing wired speakers that only have a 3.5 mm input?

In receiver mode the adapter sends audio from a Bluetooth source through the same 3.5 mm jack, so your current wired speakers or headphones plug straight in.

How can I confirm the KN321 is streaming audio correctly after I flip the mode switch?

Pair a Bluetooth device, play sound, and listen through the connected headphones or speakers — audio flowing means the link is active.

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