Monday Kids DC 3.5V-5V 5W Bluetooth 5.4 Mono Amplifier Decoder Board MP3 Player TWS 3.5mm AUX Module Receiver DIY Handmade Speaker

Product Features

• Efficient Power Amplifier: Delivers 5W output, ideal for small speakers and portable audio devices.
• Easy to Use: Supports 3.5mm audio input and TWS pairing for flexible connectivity.
• Low Power Design: Maintains energy efficiency during extended use.
• Compact Size: Slim decoding board integrates easily into various audio setups.
• Stability and Compatibility: Rigorous testing ensures reliable performance across input conditions.

Product Description

After receiving the Bluetooth module, solder the speaker and a 3.7V lithium battery following the wiring diagram. Ensure battery polarity is correct before powering on. When powered, the blue indicator should light up. If it doesn’t, shut down immediately and check the battery connections.

Once the indicator is on and you hear a beep, enable Bluetooth on your phone and search for DAU Audio to pair and begin playback.

For TWS pairing (if using two modules): disable your phone’s Bluetooth first, power on both boards simultaneously, and wait for a prompt sound. Successful pairing is indicated when one board’s LED remains solid and the other flashes. Then reconnect your phone to enjoy stereo sound.

Recommended battery: 3.7V lithium battery (500mAh–2000mAh). Charging via USB Type-C cable with 5V/1A–2A charger.

Technical Parameters

• Working Voltage: DC 3.5V–5V
• Speaker Compatibility: 2–4Ω (3W–10W), supports one 2Ω or two 4Ω speakers
• Charger: Recommended 5V/1A
• Charging Interface: Type-C
• Audio Input: 3.5mm jack
• Battery: 3.7V polymer lithium or 18650 (not included)
• Dimensions: 28.5mm × 17.3mm

Package Contents

• 1 × Bluetooth Decoding Board Module

Usage Notes

• Battery and speaker interfaces are solder pads; soldering is required and not covered by warranty.
• Type-C cannot be used for direct power—only for battery charging.
• The 3.5mm jack is for audio input only; headphones cannot be directly connected.
• Only use 3.7V lithium batteries with ≥4A protection. Low-quality or 1.5V batteries may fail under load.
• Avoid pulling soldered wires; doing so may detach pads and render the module unusable.