Bluetooth Audio Amplifier Board, ZK-TB21 2.1CH 50W x 2 +100W Subwoofer Amp Power Amplifier with Treble and Bass Control, Bluetooth5.0 and AUX Inputs, Stereo Digital AMP for DIY Home Speakers

Subwoofer Audio
Amplifier Board: 50W+50W+100W Bluetooth 5.0 wireless connection, Bluetooth+AUX audio input, 2.1 channel stereo output, with only a little sound distortion.
Note: When using AUX mode, please confirm that the Bluetooth connection of this module has been disconnected.
Treble and Bass Adjustment: This digital amp board features independent treble and bass adjustment buttons. You can directly adjust the treble and bass through the module, without using the player or speaker.
Perfect Sound Quality Experience: The audio power subwoofer amplifier module features a powerful chip, AM interference suppression function, shielding power inductance, and a low-noise front stage operational amplifier, letting you enjoy a more perfect sound quality experience.
With Protective Function: This Bluetooth amp module is designed with over-voltage protection, under-voltage protection, over-heat protection, and short-circuit protection, with a case to protect it.
Easy Installation and Use: The illustration of each interface is printed on the protective plate, making it easy to install and use even without instructions.
Small size: 4.72 in* 3.94 in* 0.7 in, easy to carry