ITEM NAME:5PCS PAM8403 2X3W Mini Audio Class D Amplifier Board Digital 2.5-5.5V In FAQ Descriptio n Feature: 1. Advanced Micro Devices, volume: 1.85 * 2.11cm 2. Excellent noise suppression in the case is not connected to the input audio, the ear close to the speaker can not hear any noise 3. Two-channel stereo, 5V power supply can output 3W +3 W power, can directly drive 4ohm 8ohm small speaker output power, full of energy, good sound quality. 4. Unique without LC filter Class D digital power board, and can be used directly to the computer's USB.5 x PAM8403 Amplifier Board. Unique without LC filter Class D digital power board, and can be used directly to the computer's USB powered. All using the machine for the entire board soldering, hand soldering iron welding quality comparable!