We will test it before shipment. Reference Weight:0.01kg (0.02lb.) 1. Volume: 23 * 24MM weight:0.45 g 2. Excellent noise suppression. in the absence of contact input audio, you will not hear any noise even put your ear close to the speaker 3. The two-channel stereo, 5V power supply can output 5W + 5W power, directly drive 4?, 8? speakers, output power, full of energy, good sound quality, with left and right channel volume adjustment. 4.unique non-LC filter Class-D digital power board, it can be used directly for the USB-powered from computers. 5. dual-panel wiring and proper solution to potential balance and channel crosstalk caused by the wiring between 6. ultra-miniature design, it can easily be placed in a small space inside a variety of digital products, high amplification efficiency. 7. Solder by hine 8. The rated working voltage 2.5-5V, limit operating voltage 5.5V Package Included: 1 x PAM8406 Digital amplifier board with volume potentiometer 5Wx2 Stereo M70