Please kindly noted that this item is sold by Jundayo from Joybuy marketplace. Origin: Mainland China _x005f_x000D_ Condition: New _x005f_x000D_ _x005f_x000D_ 7. Operating voltage: 5~12V _x005f_x000D_ 8. GND is negative level, OUN is positive level._x005f_x000D_ _x005f_x000D_ Included: 1*Digital Mono Amplifier Module 20x Gain Circuit Design: The mono voice amplifier module features a 20x gain circuit design, enhancing the volume and intensity of the audio signal.Provides a significant boost to the audio output, resulting in a more immersive listening experience. Convenient Use: The main pins of the LM386 chip are already exposed on the board.The single channel amplifier board enables direct input of audio signals, making it user-friendly and hassle-free. Compact Size: The small and compact size of 41.00x14.00x14.00mm (1.61x0.55x0.55inch) makes this power amplifier board module easy to install in various setups.Perfect for DIY projects or integrating into existing audio systems. Powerful Functionality: With a 20x gain circuit design, this mono amplifier board provides significant amplification for audio signals.Allows users to enjoy louder and clearer audio output. Onboard LM386 Chip: This digital mono amplifier module equipped with the LM386 chip, which is renowned for its amplification capabilities.Ensures high-quality sound amplification and reliable performance.