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Feature:Product Name: 2.1 channel audio amplifier moduleProduct Model: ZK-MT21Bluetooth Version: 5.0 (no shielding, 15 meters)Input Sensitivity: 500mVAudio Input: AUX + BluetoothChannel: 2.1Chip Solution: Domestic power amplifier chipPower Range: DC 12-24 V / 5A above (Do not connect to 24V battery pack)Adapter Speaker: 20-100 W, 4-8 ΩOutput Power: Left and right channels 50W, Subwoofer 100WProtection Mechanism: Anti reverse connection. Overheat. Overcurrent. Short circuitProduct Dimensions: 93mm*90mm*22mmPackage Weight : about 185g (packaging)Tip: Only when the audio input is sufficient and the power supply voltage/current is sufficient, there will be sufficient output power. The higher the power supply voltage, the greater the output power, and the smaller the speaker impedance, the greater the output power. Please make sure that the power of the adapter power supply is greater than the actual working power of the amplifier!Package includes:1 x 2.1 channel audio amplifier module(Requires simple assembly)FAQ:1. How to choose a power supply?The power supply with the board is very important. The ripple of the selected power supply must be small. A power supply with a large ripple will cause the bottom noise of the power amplifier board to become larger and there will be current noise. The higher the voltage, the greater the current, and the more adequate the output power. The power supply is 12V1A and can be equipped with 34-inch speakers. If it is above 19V 5A, there is no pr