LM386 chip: This module is based on the LM386 chip, with strong scalability Low noise: clear sound output, low noise development, bring better listening pleasure Small: The audio power amplifier is small, the speaker power range is 0.5-10W, and the distortion is small 3-12V low power consumption: 3-12V low power consumption, more cost-effective than most similar products Purpose: This module can be used for audio amplification, earphone amplification, signal amplification, electret pickup, etc. . PCB size: 42 x 30 mm Material:Metal colour:Green Package Contents: 3 x Amplifier module Only the above package content, other products are not included. Note: Light reflection 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.