Description:  1: Widely used.  2: Unique function: Support Sinilink-APP, modify Bluetooth name, set Bluetooth password, turn off/on prompt sound.  3: Volume adjustment: high-end encoder knob adjustment feels smooth.  4: There is a display diagram of the installation structure, and the installation is very fast.  5: The product is small and exquisite in appearance.     Specification:  Power supply: DC9-24V/3A above.  for Bluetooth version: 5.1.  Audio channel: 2.1 channel.  Audio input: for Bluetooth+AUX.  Audio output: left and right channels + subwoofer.  Volume adjustment: high-end encoder knob adjustment feels smooth.  Frequency range: 20HZ--30KHZ.  Signal to noise ratio: 92dB.  Output power: 50W*2 (left and right channels) + 100W (subwoofer).  Satellite box (left and right channel) adaptable speakers: 10W-50W/4-8ohm.  Subwoofer (subwoofer) adapted speaker 20W--100W/4--8ohm.  Protection mechanism: electrostatic protection, overcurrent protection, short circuit protection, overheating protection.  Unique function: Support Sinilink-APP, modify Bluetooth name, set Bluetooth password, turn off/on prompt sound.  Dimensions: 70*73*20mm.  Weight: 95g.  In order to arrive safely, the products only need to assemble the shell by themselves, and the page structure display diagram is simple and easy to understand.     Note:  The impedance of the adapted speaker is 4 ohms, and the power supply cannot exceed 12V; the impedance of the adapted speaker is 8 ohms, and the power supply cannot exceed 24V.     Packing Included:  1 x Power Amplifier Board