Bluetooth 4.2 Audio Receiver Board-with an Amplifier (2x5W)

88% of 100
SKU: DFR0720 Brand: DFRobot Guides (1)
A small size and cost-effective Bluetooth 4.2 Audio Receiver with dual 5W power amplifier circuits. It can auto-reconnect and can be powered via USB or LiPO…
$6.40 AUD, inc GST
$5.82 AUD, exc GST

In stock, ships same business day if ordered before 2PM
Delivered by Mon, 29th of Jul

Quantity Discounts:

  • 10-25 $5.65 (exc GST)
  • 25+ $5.53 (exc GST)
- +

171 from local stock, 1 supplier stock; your order will dispatch between Dec 1 to Dec 10. And yes, stock levels and lead times are accurate!


  • $6+ Standard (5+ days*, tracked)
  • $10+ Express (2+ days*, tracked)
  • FREE Pickup (Newcastle only - must order online*)

Shipping costs may increase for heavy products or large orders.

Exact shipping can be calculated on the view cart page.

*Conditions apply, see shipping tab below.

This is a small size and cost-effective Bluetooth 4.2 Audio Receiver module with dual 5W power amplifier circuits. It supports auto-reconnect and can be powered by micro USB or 3.7V lithium battery. The module can be turned into a stereo Bluetooth speaker when connected with two speakers. Also, you can connect the board to a computer via USB to use it as a sound card.

DFR0720 - Diagram

Operating Instruction

After the power is turned on, the blue indicator flashes quickly, and then the module enters the Bluetooth mode; After playing the “Beep”, it goes into the pairing mode, waiting for pairing; Turn on the Bluetooth of a phone, “MH-M38”(module Bluetooth name) will be searched and displayed, click “MH-M38” to connect to the board. It connects successfully with a Beep. When the indicator is always on, you can play your music on the phone, and the indicator keeps slowly blinking when playing music.

Example setup

power up with a computer, car usb, battery bank or wall adapter



  1. Since there is no lithium battery protection circuit on the decoder board, it is recommended to use this module with a Lipo Charger board.
  2. Pay attention to the electrostatic protection. Since the Bluetooth chip is very sensitive to static electricity, you must discharge the static electricity on your hand to avoid causing damage to the chip when touching it with a bare hand.
  3. Bluetooth antenna signal is easy to be influenced by high-frequency or strong electromagnetic signal, so please try to keep the module away from radio transmitting devices, and this board should not be placed close to any metal objects.

The module already has dual 5W power amplifier circuits, so please do not connect the external power amplifier with this board. The negative poles of two power amplifier circuits should not be connected together, otherwise, it will destroy the power amplifier chip.


  • Power Supply: 3.7V-5V (recommended power supply here)
  • Bluetooth Version: 4.2
  • Transmission Distance: 15m(Visible)
  • Audio Decoding: WAV, APE, FLAC, MP3
  • Match Speaker: 2-8Ω, 3-5W (4Ω5W speaker is recommended )
  • Dimension: 20*45mm/0.79*1.77”

Shipping List

  • Bluetooth 4.2 Audio Receiver Board-with an Amplifier (2x5W) x1

Product Comments

Exact shipping can be calculated on the view cart page (no login required).

Products that weigh more than 0.5 KG may cost more than what's shown (for example, test equipment, machines, >500mL liquids, etc).

We deliver Australia-wide with these options (depends on the final destination - you can get a quote on the view cart page):

  • $3+ for Stamped Mail (typically 10+ business days, not tracked, only available on selected small items)
  • $6+ for Standard Post (typically 6+ business days, tracked)
  • $10+ for Express Post (typically 2+ business days, tracked)
  • Pickup - Free! Only available to customers who live in the Newcastle region (must order online and only pickup after we email to notify you the order is ready). Orders placed after 2PM may not be ready until the following business day.

Non-metro addresses in WA, NT, SA & TAS can take 2+ days in addition to the above information.

Some batteries (such as LiPo) can't be shipped by Air. During checkout, Express Post and International Methods will not be an option if you have that type of battery in your shopping cart.

International Orders - the following rates are for New Zealand and will vary for other countries:

  • $11+ for Pack and Track (3+ days, tracked)
  • $16+ for Express International (2-5 days, tracked)

If you order lots of gear, the postage amount will increase based on the weight of your order.

Our physical address (here's a PDF which includes other key business details):

Unit 18, 132 Garden Grove Parade
NSW, 2289

Take a look at our customer service page if you have other questions such as "do we do purchase orders" (yes!) or "are prices GST inclusive" (yes they are!). We're here to help - get in touch with us to talk shop.

Have a product question? We're here to help!

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