Excellent noise suppression, in the absence of circumstances connected to input audio ear close to the speaker can not hear any noise, two-channel stereo, 5V power supply can output 3W 3W power, can directly drive 4?, 8? small speakers, the output power large, full of energy, good sound quality. The unique non-LC filter Class-D digital power board can be directly used computer USB power supply. Double panel wiring, wiring properly the ground potential caused by balance and -channel crosstalk, ultra-miniature design, can easily be placed in a variety of digital products within a small space, high amplification efficiency. All using the whole plate welding machine, welding quality comparable non-manual soldering iron Ultrafine size: 1.85 * 2.11cm Note: The left and right channel output of the "negative" and can not be connected together, otherwise it will burn IC, and should be preceded powered speakers connected (load). Rated working voltage 2.5 ~ 5V, limit operating voltage 5.5V. Condition: New Type: Voltage Regulator Supply Voltage: 1 Package: SMD Dissipation Power: 1 Model Number: PAM8403 Application: Computer Color: green material: plastic Package Contents: 100PCS * PAM8403 Super mini digital amplifier board Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.