HiLetgo&reg; 5pcs Super Mini PAM8403 Digital Power Amplifier Board 2*3W Class D 2.5-5V USB Power Super mini volume: 1.85 x 2.11 cm.Can be easily placed in a variety of digital products within a small space, high efficiency amplification Dual-channel stereo, 5V power supply can output 3W +3 W power, can be directly driven 4, 8 small speakers, the output power, enough energy, good sound quality. Excellent noise suppression, no audio input in the case of ear close to the speaker can not hear any noise. The unique Class D digital powerless board with LC filter can be powered directly from the computer's USB. Double-panel wiring, properly solve the wiring caused by the potential balance and crosstalk between channels