Performance Class D amplifier IC with an advanced oscillator and PLL. Multiple switching frequency options help reject AM interference. Modulation frequency up to 1.2 MHz and power output distortion under 0.1%, contributing to reduced noise. construction and connectivity. Copper DC connector and fencetype terminal designed to handle large currents with minimal heat and no damage to wires. DC head lead included and compatible with the input power interface; wiring is straightforward even if you do not have a DC head adapter or battery. HiFi stereo capability with versatile inputs. Dual channel power amplifier board for HiFi music. Two input methods: AUX and Bluetooth (2in1). Bluetooth version 5.0 delivers higher transmission efficiency and longer range. Includes a filter inductor for round, clear sound. Robust protection features. Shortcircuit and thermal protection, plus overvoltage, undervoltage, and DC protection to prevent total failure. In overload conditions, the device reports the fault condition to the processor to protect itself. Practical use scenarios Upgrade a home audio system or build a DIY stereo using AUX or Bluetooth input to drive two speakers with fidelity. Use in DIY speaker projects, taking advantage of the included DC lead and easy wiring for quick setup even without a DC head adapter or battery. Apply in small hiFi setups, Bluetooth speaker builds, or office audio arrangements where reliable protection and low noise are important.