Specification: Origin: Mainland China Type: Voltage Regulator Condition: New Application: Speaker Model Number: PAM8406 Digital Amplifier Board 1. Super micro size: 23*24MM/0.91*0.94INCH  2.Excellent noise suppression, no noise can be heard even when the ear is pressed against the speaker without connecting the input audio 3. Dual-channel stereo, 5V power supply can output 5W+5W power, can directly drive 4Ω, 8Ω small speakers, output power, sufficient energy, good sound quality, with left and right channel volume adjustment. 4. Unique Class D digital amplifier board without LC filter, can directly use the computer's USB power supply. 5. Double panel wiring, properly solve the ground potential balance and crosstalk between channels caused by wiring 6. Super miniature design, can be easily placed in the small space inside various digital products, the amplification efficiency is super high. 7. All the whole board is soldered by machine, the soldering quality is not comparable to manual soldering iron! 8. Rated working voltage 2.5-5V, limit working voltage 5.5V. Note: The "negative" terminals of the left and right channel outputs cannot be connected together, otherwise the IC will be burned, and the speakers (load) should be connected before powering on. 9. Product size: 24mm*23mm*10mm/0.94*0.91*0.39 inches  Note: Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Please allow 1-2cm measuring deviation due to manual measurement. Included: 1 x PAM8406 Stereo Audio Module 1. Ultra-Compact Size: With dimensions of only 23mm x 24mm, this pam8406 mini amplifier board is incredibly small and can be easily placed in various digital products' internal small spaces, making it perfect for a wide range of applications. 2. Excellent Noise Suppression: This audio receiver amplifier board features excellent noise suppression, ensuring that you won't hear any unwanted noise even if you put your ear next to the speaker without an input audio signal. 3. Dual-Channel Stereo Output: This digital amplifier board can output 5W+5W power with just 5V power supply, driving 4Ω and 8Ω small speakers directly. It has good sound quality and comes with left and right channel volume adjustment. 4. Unique Digital Amplifier Design: The stereo noiseless power amplifier features a unique D-class digital amplifier design without LC filtering, which allows it to use USB power from a computer directly. 5. Double-Side Wiring: The double-side wiring design helps to solve the problem of ground potential balance and channel crosstalk caused by wiring. The ultra-compact size does not compromise the power as it offers high amplification efficiency, producing powerful and rich sound quality. And the mini amplifier board is machine soldered, providing superior quality over manual soldering with iron.