Features 1.ADVANCED DIGITAL TECHNOLOGY: Digital power amplifier board uses advanced digital technology to deliver outstanding amplifier performance, fast response and high definition sound output. 2.1 CHANNEL SOUND EFFECT: Digital subwoofer power amplifier board is equipped with 2 x 15W stereo speakers and a 30W subwoofer to provide 2.1 channel sound effect. 3.BETTER SOUND EXPERIENCE: Sound amplifier board supports total volume adjustment and low volume adjustment, allowing users to freely adjust the volume as needed for a better sound experience. 4.STEREO VOLUME ADJUSTMENT: Subwoofer power amplifier board has a stereo volume adjustment function, which can enhance the spatial sense of the sound, making the sound more live. 5.DC12V POWER SUPPLY: Digital amplifier board supports DC12V power supply, allowing users to use it more conveniently. Interface is very friendly, easy to install, suitable for a variety of occasion. specificationItem Type: Digital Power Amplifier Board Material: PCB Product Model: XH A355 Input Voltage: DC12V Operating Current: 4A Above Output Power: Bass 30W, 2 x 15W Sound Input: 3.5mm AUX Amplifier Chip: 2 x YDA138 Number Of Channels: Dual Channel, Subwoofer Product Size: Approx. 80x60x15mm / 3.1x2.4x0.6in PackageList1 x DigitalPowerAmplifierBoard NotePlease allow some error due to manual measurement.