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Small square Bluetooth 5.0 adapter with 3.5mm and Micro USB ports

VR-robot KN321 Bluetooth 5.0 Audio Transmitter Receiver Adapter

SKU CH-ZNJK-09D51

A 2-in-1 Bluetooth 5.0 adapter switches between transmitter and receiver modes to stream audio wirelessly over 3.5 mm connections

  • Audio channels2
  • Connection typesMicro USB, 3.5 mm
  • Size and weight1.73 in × 1.73 in × 0.47 in
  • 2-in-1 transmitter and receiver switches with a simple flick
  • Bluetooth 5.0 delivers stable wireless audio up to 33 ft
  • Built-in 200 mAh battery provides up to 6 hours playback
  • Plug-and-play via 3.5 mm cable with no driver required
  • Compact 1.73 in square design fits in any bag

Compact 2-in-1 Bluetooth 5.0 Adapter

The VR-robot KN321 is a pocket-sized Bluetooth 5.0 audio transmitter and receiver. It adds wireless streaming to wired speakers, headphones, TVs or car stereos via a 3.5 mm connection. The built-in 200 mAh battery provides up to six hours of cable-free operation.

Fits Any 3.5 mm Source or Sink

A sliding switch selects transmitter or receiver mode without software. In transmitter mode it sends audio from a non-Bluetooth TV, CD player or PC to Bluetooth headphones or speakers. In receiver mode it pulls audio from a phone or tablet to wired gear. The package includes a 3.5 mm cable and a 3.5 mm to 2-RCA cable for broader compatibility.

Streams Up to 10 m with aptX Low Latency

Bluetooth 5.0 delivers a stable link up to 10 metres or 33 feet in open space. The aptX codec keeps lip-sync tight for video, but the adapter pairs with only one Bluetooth device at a time. Battery recharge takes about two hours via Micro USB.

How it compares

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

Price $12.99
Cheaper than about 98% of the 297 comparable items (median $63.99).

Specifications

Product
Brand nameVR-robot
Model nameKN321
Part numberEar Candles Cocaine Heroin
Audio & video
Audio channels2
Ports & slots
Connection typesMicro USB, 3.5 mm
Size & build
Size and weight1.73 in × 1.73 in × 0.47 in
More details
Remote controllerNo

Questions about this item

How long does the 200 mAh battery last during continuous streaming?

The built-in 200 mAh lithium battery provides up to 6 hours of continuous use before it needs recharging.

Does the adapter generate noticeable heat or noise during all-day operation?

The compact 1.73 in × 1.73 in × .47 in unit has no fan and runs silently; it stays cool during extended use because it draws very little power.

What cables or ports must my TV or speakers already have for this adapter to work?

Your source device needs a 3.5 mm audio output or the included 3.5 mm-to-2RCA cable; the adapter connects via its 3.5 mm jack and charges over Micro USB.

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