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Compact Bluetooth 5.4 adapter with rotatable 3.5 mm plug and USB-C cable, matte black finish

Sunnymark Bluetooth 5.4 Transmitter Receiver 2-in-1 Car HD Radio

SKU CH-89BJ-SCDC2

A 2-in-1 Bluetooth 5.4 transmitter and receiver streams audio to two headphones or receives from two phones with aptX Adaptive latency under 40 ms

  • Tuning rangeBluetooth
  • FM frequency responseBluetooth, Stereo
  • FM selectivityBluetooth, bluetooth
  • FM stereo separationStereo
  • AM selectivityAvoid exposure to extreme temperatures. Keep the device away
  • AM stereo separationStereo
  • 2-in-1 transmitter and receiver streams audio to wired or wireless devices
  • Dual-link TX mode sends sound to two Bluetooth headphones at once
  • Bluetooth 5.4 with Qualcomm aptX Adaptive keeps latency under 40 ms
  • 180° rotatable 3.5 mm plug plus USB-C cable fits tight ports
  • Up to 26 hours RX or 15 hours TX battery life per charge

Versatile 2-in-1 Bluetooth Audio Adapter

The Sunnymark unit operates as both a transmitter and a receiver, letting you stream audio from a non-Bluetooth source to wireless headphones or send sound from a phone to wired speakers. It suits travellers, gym users and anyone wanting wireless audio from legacy equipment. It is not for buyers who need aptX Lossless or professional-grade musical instrument connectivity.

Bluetooth 5.4 Range and Latency Limits

Bluetooth 5.4 provides a stable link with latency under 40 ms, keeping video and audio in sync for movies and gaming. Real-world range depends on obstacles and interference, so performance will vary between an open cabin and a crowded gym. The adapter does not support Wi-Fi or proprietary low-latency protocols beyond the stated Bluetooth specification.

Check Ports and Power Before Buying

Verify your source device has a 3.5 mm aux output or a USB-C audio port compatible with the included 180° rotatable plug and cable. Confirm the receiving headphones or speakers support standard Bluetooth audio profiles. The internal battery delivers up to 15 hours in transmit mode or 26 hours in receive mode, requiring a two-hour recharge via USB-C.

How it compares

Measured against everything we stock in HD Radio Tuners & FM Transmitters, at today’s prices. Recalculated every night.

Price $18.99
Cheaper than about 70% of the 127 comparable items (median $27.99).

Specifications

Product
Brand nameSunnymark
Audio & video
FM frequency responseBluetooth, Stereo
Power
Power sourceCorded Electric
Size & build
Product weight0.118 kg
Compatibility
Compatible withHome Stereo System, TV, PC, Laptop, PS5/PS4, Game Console, Phone, Tablet , Car Speaker, Speaker, Headphones, Earphones (Note:Not suitable for guitars, pianos, or other professional musical instruments.)
More details
Tuning rangeBluetooth
FM selectivityBluetooth, bluetooth
FM stereo separationStereo
AM selectivityAvoid exposure to extreme temperatures. Keep the device away from water. Follow proper battery charging and disposal guidelines., Stereo
AM stereo separationStereo

Questions about this item

Should I pick the TX or RX mode for my setup?

Choose TX mode to send audio from a TV or airplane seat to one or two Bluetooth headphones. Choose RX mode to stream from a phone to a wired speaker or car stereo.

What does the 40 ms latency figure mean when I am gaming or watching video?

Audio stays in sync with the picture so you will not notice a delay between what you see and what you hear.

How does Bluetooth 5.4 affect the connection?

It provides a faster, more stable link with the ultra-low latency that keeps sound and video aligned.

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