Item Type: Digital Power Amplifier Module <br>BT Version: 5.0 (Unobstructed, Approx. 15 Meters / 16in) <br>Input Sensitivity: 500mV <br>Input Method: AUX+BT <br>Number of Channels: 2.1 Channels <br>Power Amplifier Chip: Domestic Power Amplifier Chip <br>Adapter Power Supply: Above DC12-24V/5A (24V Battery Pack is Not Allowed) <br>Adapted Speakers: 20-100W 4-8Ω <br>Output Power: Left and Right Channels <50W <br>Subwoofer <100W <br>Protection Mechanism: Anti-Reverse Connection, Overheating, Overcurrent, Short Circuit Protection<br>1、AUX+Bluetooth audio input, subwoofer+left and right channel output.Use large-capacity energy storage capacitors <br>2、Low noise level operational amplifier, external antenna or antenna base solder joint <br>3、Adapter power supply above DC12?24V/5A (24V battery pack is not allowed) <br>4、2.1 channel. Anti?reverse connection, overheating, overcurrent, short circuit protection <br>5、Output power, left and right channels &lt;50W, subwoofer &lt;100w.Adaptation speaker 20-100W, 4-8Ω1.Please allow 0?2 cm error due to manual measurement. Thanks for your understanding. <br>2.Only when the audio input is enough and the power supply voltage/current is enough, there will be enough output power. <br>3.The higher the power supply voltage, the greater the output power, and the smaller the speaker impedance, the greater the output power. <br>4.Please make sure that the power of the adapter power supply is greater than the actual working power of the amplifier.<p>1 x&nbsp;Digital Power Amplifier Module</p><p>2 x Board</p><p>1 x Screwdriver</p><p>1 x Screw Accessories</p><p>5 x Snap</p><p>1 x Connector</p>