1. Microphone suppression function 2. Microphone volume and master volume are both independently adjustable 3. High-end metal brushed panel 4. Analog wireless microphone board interface 5. Support effect adjustment Specifications: Product Name: 2.1 Channel Bluetooth Amplifier Board Product Model: D900B Bluetooth: 5.0 (unobstructed, 10 meters) Input Sensitivity: 500mV Input Method: Bluetooth+AUX+MICFM+USB+TF card Channel: 2.1 Amplifier Chip: U.S. original chip Adaptable Power Supply: DC 12~24V/5A or above (the higher the voltage, the higher the output power) Adaptive Speaker: 20~100W,4~8 Ohm Output Power: Left and right channel ≤50w Subwoofer ≤100W Protection Mechanism: Over-voltage, under-voltage, over-temperature, detection, short-circuit protection Plug Type:EU Plug,it applies to Indonesia, Germany, France, Spain, Italy and so on. Voltage: AC220V Color: As Shown Material: Metal Package Contents: 1 * Amplifier board 1 * Remote control (2 AAA batteries not included) 1 * DC cable 1 * Power cord Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.