5pcs Bluetooth Audio Receiver Board BT 5.0 Stereo Audio Amplifier 3.7-5V Car Speaker Amplifier for DIY

I wanted something for my classroom audio system, to not fiddle with wires during class. Exactly what I needed for a perfect price. Now I have one at home and at school. The range isn't awesome, if my phone is in my pocket it will start to cut out. But from my laptop, it works great. Sound quality is good! Connects to my devices easily!

Easy to install. It works perfect in order to convert my wired speakers to Bluetooth. Wonderful module

Received units simply work as they should, no bad surprises despite some negative reviews. Pairs with my iPhone in a snap and stays connected, good audio quality for a basement gym, aux input in an old car, etc.

This uses a JieLi AS20BP03444-25D4. Don't confuse this with JL Audio. It performs well, however it has a very accented voice notifications that I would love to remove from the programming. I even went so far to look into reprogramming this chip, however it appears to be a write-once-and-done deal. From my research, programming these chips requires specific hardware that will put the chip into programming mode, then the software will upload a key to put it into a writable state, then the custom firmware is uploaded to the chip. This device can be powered by as little as 2.5V, but I would recommend keeping it above 3.2 for it to properly work. Without connection, it only consumed about 7~14 milliamps at 5 volts. A standard voltage lithium cell will power this nicely, but be sure to use a battery regulator board, or this device will overdraw the battery and deplete it. This board does not include any lithium regulation circuitry, and will not charge your battery. It has excellent range, and it remained connected from over 50ft away through interior (hollow) walls. It can be used as a USB sound card if you bridge the pads underneath. No microphone input, but a simple DAC. It showed up in windows as a JeiLi B21 USB sound card (uses standard Windows drivers). It showed as only 16-bit 48kHz. It might not be audiophile quality, but if you need a simple sound card, you're all set!

I've only had these for a few days, but they are excellent. Connecting to the device was a little confusing. The audio quality is excellent.

These are the best DIY devices I've purchased in years. I've added BT internally to two speaker systems and the results were amazing. I've actually replaced my BT earphones, which no longer work, by putting one of these in my pocket with a small phone charger I got free from the local lottery guy. Works great!! The best thing is that it benefits from all the BT spec upgrades to BT5.0 - works with almost anything!

The output is a little too low. You might need a preamp before a typical amplifier. These are quite a bit too low if you are considering adding Bluetooth to an antique radio.

An affordable way to add Bluetooth to your project. Connects automatically once registered on your device.