Reference Weight:0.017kg (0.04lb.) 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 4 8 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 powered. 5.Dual-panel wiring, properly solve the crosstalk between the ground potential balance and channel wiring 6.Ultra-miniature design, can easily be placed in the internal space for a variety of digital products, ultra high zoom efficiency. 7.All using the hine for the entire board soldering, hand soldering iron welding quality comparable! 8.Rated working voltage 2.5-5V, limit operating voltage 5.5V. Note: The left and right channel output of the "negative" can not, and then together, otherwise it will burn the IC and energized speaker (load) connected before. Shipping List: 10PCS * 2 Channels 3W PAM8403 Class D Audio Amplifier Board