ZK-MT21 2x50W+100W 2.1 Channel Subwoofer Digital Power Amplifier Board AUX 12V 24V Audio Stereo Bluetooth-compatible 5.0 Bass Amp for Home Theater Speaker
Feature:
The Bluetooth-compatible audio power amplifier module has 2.1 channels and the maximum output power is 2X50W+100W.
It has two audio input modes, AUX and Bluetooth-compatible, and a two-in-one power amplifier board. Bluetooth-compatible5.0, higher transmission efficiency, longer transmission distance
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, treble, 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, speakers, etc.

Specification:
Product name: 2.1 channel Bluetooth-compatible audio power amplifier module
Product model: ZK-MT21
Bluetooth-compatible version: 5.0 (unobstructed, 15 meters)
Input sensitivity: 500mV
Input method: AUX+ Bluetooth-compatible
Number of channels: 2.1 channels
Power amplifier chip: Domestic power amplifier chip
Adapter power supply: above DC12-24V/5A (24V battery pack is not allowed)
Adapted speakers: 20-100W, 4-8Q
Output power: left and right channels <50W; subwoofer <100W
Protection mechanism: Anti-reverse connection, overheating, overcurrent, short circuit protection
Product size: 93mm*90mm*22mm
Product weight: about 130g

Notice:
The product can be connected with an external antenna, but does not include an antenna and an antenna base, please purchase it separately.
Tip: Only when the audio input is enough and the power supply voltage/current is enough, there will be enough 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 adapted power supply is greater than the actual working power of the amplifier!!!

Note:
Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you!
Please allow 1-2cm measuring deviation due to manual measurement. 

1 X Power Amplifier Board
1 X Accessory Pack