About this item [Two Input Methods] It has two audio input methods: Bluetooth and 3.5mm AUX. Bluetooth 5.0 version, higher transmission efficiency, transmission distance up to 49 feet (no obstruction). [Treble and Bass Adjustment] 2.1 channel, maximum output power 2X50W+100W. By adjusting the high and low frequency knobs, you can make the sound more layered and the bass more shocking. [Protection Function] It has short circuit protection, overcurrent, overheating, and anti-reverse connection protection. When an overload occurs, the device reports the fault condition to the processor to protect itself from damage. [High Quality] Features copper DC connectors and barrier style terminals. It can withstand large currents without generating heat or damaging wires. Comes with a DC head lead, which is compatible with the input power interface of this product. Even if you dont have a DC head adapter or battery, you can easily connect it. [Application] Widely used in store solicitation, home th