HIFI Sound Quality Adopts TPA3116D2 Class D chip with less than 0.1% distortion even under high power operation. Modulation frequency up to 1.2MHz. Built-in filter capacitor helps reduce noise for clearer audio output. AUX and Bluetooth Input Features two audio input options: wireless Bluetooth 5.0 and 3.5mm auxiliary input. Provides stable wireless connection within a 15-meter range. Dual Channel Stereo Audio Amplifier Supports DC 5V-27V power input and is compatible with 4/8 ohm speakers rated 30W-200W (recommended 30W-50W). Proper voltage and current supply are required for optimal output performance. Protection Functions Includes protective casing and supports protection against reverse connection, over voltage, under voltage, over temperature, and short circuits. Application Volume controlled via potentiometer with power switch for easy adjustment. Suitable for DIY speaker projects, home theaters, and other audio applications.