Features: Experience powerful stereo sound with this compactly PAM8403 amplifier board, delivering 3W per channel via USB power for clear audios in any setups. Features builts in volumes control potentiometer, reverse polarity protections, and low noise design for efficient power conversion up to 90% with minimal heat generation. Ideal for DIY electronics enthusiasts, audios project builders, and hobbyists creating portable speakers or upgrading home entertainment systems. Perfect for compactly audios projects like desktop amplifiers, car audios systems, or portable Bluetooth-compatible speaker conversions requiring reliable 5V USB power. Compatible for smartphones, PC, and tablets, this digital amplifier board supports stereo output while safeguarding against overheating and short circuits. Specifications: Component:Plastic Size:Approx.31.5x20x15mm/1.24x0.79x0.59inch Model: XTW8403 Power Supply: DC5V Minimum Output: 3Wx2 Option Type:1pc,3pcs; Package Includes: Package A 1pc Digital Amplifier Board Package B 3pcs Digital Amplifier Board note: Please allow 1-10mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual item color.