Feature: 1. 100% Brand new and high quality 2. PAM8403 is a small digital amplifier chip, which highlights the advantages of digital chip 3. Circuit adopts the reasonable configuration, power filtering is upgraded to 470 uf, 1.6 mm glass fiber sheet, great performance 4. Output of 3 w + 3 w high-fidelity sound quality 5. The potentiometer adopts the original anti-watch body, and the potentiometer with the switch counterclockwise can cut off the power directly Specification: Features: 100% Brand new and high quality PAM8403 is a small digital amplifier chip, which highlights the advantages of digital chip. Circuit adopts the reasonable configuration, power filtering is upgraded to 470 uf, 1.6 mm glass fiber sheet, great performance Output of 3 w + 3 w high-fidelity sound quality The potentiometer adopts the original anti-watch body, and the potentiometer with the switch counterclockwise can cut off the power directly. Specifications: Power supply range: 5V DC Lowest output: 3W*2 Size: 3.5 x 3cm / 1.38 x 1.18inch Weight: 9g Quantity: 4 pcs Package included: 4 x Mini Amplifier Board