Features: The Bluetooth-compatible audio power amplifier-module has 2.1 channels and the maximum output power is 2X50W+100W. It has short-circuit protection, over-current, over-heating, and anti-reverse protection to prevent total failure. When an-overload occurs, the device reports the fault-condition to the processor to protect itself from damage. It adopts copper-DC connectors and barrier terminals. It can withstand-high current without heating or damaging wires. Classic appearance multi-function main knob. The-main knob adopts a rotary-encoder that is only used in high-end power amplifiers, which realizes 360-degree stepless tuning-and a smooth one-key start and stop. The operation is simple and convenient by long pressing the-switch. With-bass, subwoofer frequency and volume control, you can easily adjust the volume and enjoy-the music tone you want. It is widely used in shopping malls, home theaters, speaker, etc. Specifications: Material:Electronic Component Size:Approx.13.4x13.5x2.4x1.05cm/5.27x5.31x0.94x5.9inch Color: Black Type:AM100 Shell-Version Type:AM100 Shell-less Version Package Includes: 1x Power Amplifier Board note: ①.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. ②.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings.