TDA7492 50Wx2 Digital Dual Channel Amplifier Module Stereo AMP Board with CSR8635 Bluetooth V40 Receiver and MicrophoneJAS Digital amplifier has a higher overload capacity than analog amplifier, and it won't cause crossover distortion, transient inter modulation distortion and you don't have to worry about the loudspeaker internal resistance_x000D_ It supports Bluetooth V4.0 audio input and DC 8V to 25V voltage input_x000D_ Using NE5532 pre-amp, and TDA7492 chip for dual channel of 50W+50W power output_x000D_ Sound quality is very good by using this audio power amplifier module_x000D_ Applicable speaker impedance are 4, 6, 8ohm, great for turning normal speaker into Bluetooth speaker_x000D_ _x000D_ colour:Photo color_x000D_ Material:ABS_x000D_ size:8 x 5 x 2cm_x000D_ _x000D_ Package Contents:_x000D_ 1 x Amplifier Board_x000D_ _x000D_ Only the above package content, other products are not included._x000D_ Note: Light shooting 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. _x000D_ _x000D_