1. HIFI Stereo dual channel power amplifier board for HIFI music. With AUX and Bluetooth two audio input methods, 2in1. 5.0 Bluetooth version, the transmission efficiency is higher and the transmission distance is farther. With a filter inductor, the sound is round and clear. 2. It adopts copper DC connector and fence type terminal. It can withstand large current, no heat, no damage to the wire. DC head lead, compatible with the input power interface of this product. Even if you dont have a DC head adapter or battery, it can be easily wired. 3. Performance Class D amplifier IC with very index parameters. Advanced oscillator / PLL circuit uses multiple switching frequency options to reject AM interference. The modulation frequency can be up to 1.2MHZ, and the power output distortion is less than 0.1%. This helps prevent noise. 4. Protection Mechanism Devices feature shortcircuit and thermal protection as well as overvoltage, undervoltage, and DC protection to prevent total failure. In the event of an overload, the device reports the fault condition to the processor to protect itself from damage. Use scenarios Home stereo system: pair with passive speakers for enhanced HIFI playback and use the AUX or Bluetooth input for wireless streaming. DIY active speaker or desktop speaker: integrate this amp board with a suitable power supply and speakers for a compact, efficient Bluetoothenabled setup. Portable or batterybased projects: use the DC head lead to wire easily when a DC head adapter or battery is available, enabling a lightweight amplifier option for mobile audio builds.