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Small black box with optical, coaxial and 3.5 mm ports, USB slot and toggle switch

KAIY HY28 Bluetooth 5.4 Audio Receiver Optical Coaxial AUX USB Playback

SKU CH-8DAY-3EWBZ

Adds Bluetooth 5.4 streaming plus USB playback to any stereo through optical, coaxial or 3.5 mm outputs

  • Channels2
  • Power Supply1 volts_of_direct_current
  • Remote Controlfalse
  • Featuresbluetooth adapter for home stereo receiver
  • Dimensions & Weight3.85 in x 2.91 in x 3.67 in
  • Upgrade vintage stereo to wireless with Bluetooth 5.4
  • Optical, coaxial and 3.5 mm AUX outputs for clean digital audio
  • USB flash drive playback of MP3, FLAC and WMA files
  • Automatic phone reconnection whenever the unit powers on
  • Receiver-only design sends audio to wired speakers, requires USB-C power

Instant Wireless Upgrade for Wired Audio Systems

The KAIY HY28 turns any vintage receiver, amplifier or pair of wired speakers into a Bluetooth-enabled music system. Connect a phone, tablet or laptop wirelessly and stream music through existing home stereo equipment. The receiver-only design accepts Bluetooth 5.4 signals and outputs audio through optical, coaxial or 3.5 mm AUX ports. No remote control is included; volume and playback are managed via the onboard toggle buttons.

Stable Streaming with Flexible Power

Bluetooth 5.4 delivers reliable wireless streaming up to 33 feet indoors or outdoors. The unit draws power from a USB-C source supplying 1 volt of direct current, so it runs continuously from a wall adapter, computer port or portable power bank. An anti-slip pad keeps the compact chassis (3.85 in x 2.91 in x 3.67 in) secure on shelves or equipment racks. Auto-reconnect restores the last paired device automatically whenever the unit powers on.

Adds Bluetooth and USB Playback to Legacy Gear

This adapter replaces the need for a separate Bluetooth dongle and a dedicated USB media player by combining both functions in one box. Insert a USB flash drive loaded with MP3, FLAC or WMA files for standalone playback when a phone is not available. The jump is worth it for owners of older stereo systems who want wireless streaming and local file playback without replacing their amplifier or speakers. Buyers needing a transmitter to send audio to Bluetooth headphones should look elsewhere.

Highlights

  • Upgrade vintage stereo to wireless with Bluetooth 5.4
  • Optical, coaxial and 3.5 mm AUX outputs for clean digital audio
  • USB flash drive playback of MP3, FLAC and WMA files
  • Automatic phone reconnection whenever the unit powers on
  • Receiver-only design sends audio to wired speakers, requires USB-C power

Specifications

BrandKAIY
ModelHY28
Channels2
Power Supply1 volts_of_direct_current
Remote Controlfalse
Featuresbluetooth adapter for home stereo receiver
Dimensions & Weight3.85 in x 2.91 in x 3.67 in

Questions about this item

How do I install the HY28 and which switch position do people forget?

Connect USB-C power, link your stereo via optical, coaxial or 3.5 mm AUX, then slide the OFF-USB-BT switch to BT before pairing — skipping the switch step is the most common mistake.

What maintenance or replacement will the HY28 need later?

The unit has no internal battery or user-serviceable parts; only the USB-C power cable or flash drive may wear out and need replacing over time.

What limit appears first during sustained use of the HY28?

Continuous operation requires constant USB-C power; if the supply is interrupted the receiver stops immediately, so power stability is the first practical limit.

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