Stream Music Wirelessly to Any Stereo System

Upgrade any wired speaker, home stereo, car audio system, or headphone into a wireless audio hub with the NFC Bluetooth 5.0 Audio Receiver (Model B21). Ultra-compact and powered via USB Type-C, it connects instantly via NFC tap or Bluetooth pairing — no built-in battery required, just plug in and play.

Key Features

Bluetooth 5.0 Chip: Enjoy a stable, fast wireless connection up to 33 feet (10m) with virtually zero dropouts.
NFC One-Tap Pairing: Simply tap your NFC-enabled device to pair instantly — no menus, no fuss.
Dual Device Link: Pair two smartphones or tablets simultaneously and switch between them effortlessly.
Multiple Output Options: Connect via 3.5mm AUX stereo jack and dual RCA (left/right) outputs at the same time — perfect for home stereos, amplifiers, and wired speakers.
U Disk Playback: Plug in a USB flash drive to play MP3, FLAC, WMA, APE, and WAV files directly — no phone needed.
Hands-Free Calling: Built-in microphone lets you answer, redial, hang up, or reject calls with one button. Navigation voice prompts broadcast through your speakers so you keep your eyes on the road.
Auto Power-On & Auto-Reconnect: Powers on the moment USB is connected and automatically reconnects to the last paired device — ideal for car installations.
3-Button Control: Volume Up / Next Track, Volume Down / Previous Track, and a Multifunction Button for calls and playback.
Hi-Fi Audio Quality: 20Hz–20kHz frequency response, 90dB SNR, and 0.1% THD deliver clean, clear stereo sound.
Space-Saving Design: Measures just 78 × 50 × 18mm — barely noticeable, highly capable.

Technical Specifications

Model	B21
Bluetooth Version	5.0 (Protocols: A2DP, AVRCP)
Wireless Type	Bluetooth + NFC
Output Interfaces	3.5mm AUX stereo, Dual RCA (L/R)
Input/Power	USB Type-C (no built-in battery)
Supported Codecs	SBC, AAC
Supported Formats (U Disk)	MP3, FLAC, WMA, APE, WAV
Frequency Range	2400–2483.5 MHz
Frequency Response	20Hz–20kHz
Output Power	28mW (RL=16Ω)
Signal-to-Noise Ratio	90dB
THD	0.1%
Range	Up to 10m (33ft)
Dimensions	78 × 50 × 18mm

What's in the Box

Choose from two package options at checkout: No RCA Cable or With RCA Cable included.

Compatible With

Car audio systems (non-Bluetooth head units)
Home stereos and amplifiers
Wired headphones and speakers
Home theater receivers
Any device with a 3.5mm AUX or RCA input

Note: This is a Bluetooth receiver only — it is not a transmitter and is not compatible with TV audio output, keyboards, or mice.

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Frequently Asked Questions

Q: Does the Bluetooth 5.0 Audio Receiver work with any car stereo or home speaker?

A: Yes! As long as your car stereo, home speaker, amplifier, or headphone has a 3.5mm AUX input or RCA inputs, this receiver will work. Simply plug the receiver into a USB power source (such as a car USB port or USB wall adapter), connect the audio cable to your speaker system, and pair your phone via Bluetooth or NFC tap. It's compatible with virtually all non-Bluetooth audio equipment.

Q: Can I connect two phones at the same time?

A: Absolutely. The B21 supports Dual Device Link, meaning you can simultaneously pair two smartphones or a smartphone and a tablet. Both devices stay connected, and you can stream music or take calls from either one without re-pairing.

Q: Does it need batteries or a separate power supply?

A: The B21 has no built-in battery. It is powered entirely via its USB Type-C port. You can use a car's USB port, a USB wall adapter, or any USB power source rated 5V. Because it draws power directly, it also features an Auto Power-On function — as soon as power is supplied (e.g., when you start your car), the receiver turns on and reconnects to your last paired device automatically.

Q: What audio file formats does U Disk playback support?

A: When playing audio from a USB flash drive (U Disk), the receiver supports MP3, FLAC, WMA, APE, and WAV formats — covering the most popular lossless and compressed audio file types for high-quality playback without needing a connected phone.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.