• Power Supply (Left Terminal): Connect a 3.7V Lithium battery or a regulated 5V DC power source. The red wire is Positive and the black wire is Negative (

 / Ground).

• Left Speaker (Middle Terminal): Connect to your left audio channel speaker.
• Right Speaker (Right Terminal): Connect to your right audio channel speaker.
• Micro-USB Port: Used alternatively to supply 5V power or plug directly into a computer to use the board as an external USB sound card.

📋 Technical Specifications

• Bluetooth Version: 4.2
• Amplifier Type: Class-F (high efficiency with low radio interference)
• Output Power: 5W + 5W (Stereo)
• Matching Speakers: 4

 impedance (3W to 10W power rating)

• Transmission Distance: Up to 15 meters in open spaces
• Max Working Current: 5V / 2A