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Tiny square black plastic Bluetooth 5.0 adapter with 3.5 mm jack

dealfans

dealfans USB-BT400 Bluetooth 5.0 audio adapter

SKU CH-MXNE-GE3JD MPN USB-BT400

A 2-in-1 Bluetooth 5.0 transmitter and receiver streams audio wirelessly through a 3.5 mm jack

  • Product typeBluetooth Adapter
  • Compact 44 mm design fits any bag
  • Weighs only 18 g for easy travel
  • Bluetooth 5.0 enables wireless audio streaming
  • 5 mm jack connects to headphones or speakers
  • Switches between transmitter and receiver modes

USB Bluetooth audio adapter

The dealfans USB-BT400 is a Bluetooth 5.0 audio transmitter and receiver that connects to a 3.5 mm jack. It adds wireless streaming to headphones, speakers or car audio systems without built-in Bluetooth. The compact plastic body measures 44 × 44 × 12 mm and weighs 18 g.

For adding Bluetooth to non-wireless audio gear

This adapter suits users who want to stream music from a phone or laptop to wired headphones, powered speakers or a car aux input. It also works as a transmitter, sending TV or PC audio to Bluetooth headphones. Buyers who need aptX, LDAC or multipoint pairing should look at a different device.

Bluetooth 5.0 with 3.5 mm analogue connection

The single specification that decides fit is the Bluetooth 5.0 radio paired with a 3.5 mm connector for analogue audio in and out. No USB audio class or digital output is provided, so the source and sink must both support a 3.5 mm line-level connection.

How it compares

Measured against everything we stock in Audio Jack & RCA Adapters, at today’s prices. Recalculated every night.

Price $7.99
Cheaper than about 91% of the 1,324 comparable items (median $16.99).

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Specifications

Product
Brand nameDealfans
Model nameWD#401042530359_0
Product typeBluetooth Adapter

Questions about this item

Does the 18 g adapter need any battery replacement or charging routine?

It runs from the host USB port so there is no internal battery to replace; just plug it in and use it.

What range limit appears first when streaming continuously over Bluetooth 5.0?

The practical limit is the standard Bluetooth 5.0 range of about 10 metres in open space; walls or interference will reduce it sooner.

Does the 44 × 44 × 12 mm body get warm or draw noticeable power during all-day use?

It draws only USB low-power current and stays cool; no fan or heatsink is needed for continuous operation.

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