We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
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

  • Audio channels2
  • Power supply1 V DC
  • Size and weight3.85 in × 2.91 in × 3.67 in
  • Key featuresBluetooth adapter for home stereo receiver
  • 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.

How it compares

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

Price $26.99
Cheaper than about 86% of the 297 comparable items (median $63.99).

Specifications

Product
Brand nameKAIY
Model nameHY28
Audio & video
Audio channels2
Power
Power supply1 V DC
Size & build
Size and weight3.85 in × 2.91 in × 3.67 in
More details
Remote controllerNo

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.

More in Wi-Fi & Bluetooth Audio Devices

Similar items