Description: Adopt TPA3116 The main circuit of the electrolytic capacitor signal adopts 470uF/25V*6 to ensure strong and continuous power support. The resistor uses high-precision chip resistors to ensure a good signal-to-noise ratio. The PCB adopts 1.6mm thick double-sided sheet, 2.0 oz copper thickness, and the whole process of tin-spraying ensures the good passing performance of the current. First-class PCB quality. The red high current inductor is used to ensure the sound is crisp and powerful. Input AUX with gold-plated RCA lotus seat Specification: Working method: Class D Quiescent current: 50mA Work efficiency: 90% Rated output power: 2*50W Frequency response: 20Hz to 20KHz Working voltage: DC18V to DC24V Maximum output current: 4A Package Includes: 1Piece Digital Amplifier 1Piece Antenna Note: Bluetooth and SD card support formats: WAV FLAC APE MP3. If the card is incompatible, you can reformat the SD card to FAT32. Before turning on or off, first turn the volume to the minimum, the switch is off, and then turn on the external power supply, so as to avoid the startup or shutdown impact.