MP3 Bluetooth 5.0 Receiver Board 4Pcs Pack - Small Decoding Module

In this review we look at a compact solution for adding wireless audio to existing speakers and receivers. The MP3 Bluetooth 5.0 Receiver Board 4Pcs pack is aimed at hobbyists, tinkerers and anyone who wants to retrofit a set of speakers or a home amplifier with Bluetooth streaming without replacing larger components. The single biggest reason to buy is its combination of a true Bluetooth 5.0 audio receiver chipset with lossless file support, which makes it an efficient, low-cost way to add modern streaming to older audio equipment.

Key Features

• Compact form factor: At about 3x3cm each, these boards slip into small enclosures or behind panels to convert existing speakers without major modification.
• Bluetooth 5.0 connectivity: The receiver uses BT5.0 for longer range and more stable streaming while remaining backward compatible with older devices.
• Wide power tolerance: The boards accept a Micro USB 5V supply or a 3.7V to 5V input, making them adaptable to battery or USB power options.
• Standard audio output: Each board has a 3.5mm stereo output for connecting headphones, amplifiers, or line inputs on a receiver.
• Lossless format support: Playback supports common high-quality file types such as MP3, APE, FLAC and WAV for better fidelity from streamed or local sources.

Who It's For

These modules are best for DIY audio enthusiasts who want to add Bluetooth streaming to bookshelf speakers, vintage stereos, or small active speaker projects. The tiny 3x3cm boards are ideal where space is tight and a simple 3.5mm line output is sufficient to feed an amplifier or headphone jack.

Those seeking a complete amplifier with speaker outputs, volume controls, or advanced digital controls should look elsewhere; this product is a receiver/decoder board intended as a building block rather than a finished consumer unit.

Pros & Cons

Pros

• Small size makes integration into enclosures straightforward for custom installations.
• Bluetooth 5.0 offers improved range and stability compared with older Bluetooth versions.
• Supports lossless audio files like FLAC and WAV, improving playback quality for high-resolution sources.
• Flexible power options let you run the board from USB 5V or 3.7V battery sources.

Cons

• Boards provide a 3.5mm line output only, so users needing speaker-level outputs will still require an external amplifier.
• No built-in controls or enclosure are included, so some DIY assembly and wiring skill is required.

Specifications

Size	3x3cm (1.18x1.18in)
Power supply	3.7V - 5V (Micro USB 5V supported)
Bluetooth version	Bluetooth 5.0 (backward compatible)
Supported formats	MP3, APE, FLAC, WAV
Audio interface	3.5mm stereo output
SNR	91 dB
Total harmonic distortion + noise	-70 dB

Our Verdict

The 4Pcs MP3 Bluetooth 5.0 Receiver Board pack is a practical, cost-effective way to add modern wireless streaming and lossless playback support to existing audio gear. It is well suited to DIYers and those upgrading vintage equipment, offering solid signal-to-noise performance and flexible power options. If you need speaker-level outputs or a finished product with controls, combine these boards with a small amplifier or enclosure for best value.

Frequently Asked Questions

Can these boards be powered from a USB phone charger?
Yes, they accept a standard Micro USB 5V supply and can be powered from most USB chargers or power banks.

Do these boards provide speaker outputs?
No, the boards provide a 3.5mm stereo line output; a separate amplifier is required to drive passive speakers.

What Bluetooth profiles are supported?
The boards support A2DP, AVCTP, AVDTP and HFP profiles for audio streaming and call handling where applicable.