Tpa3221 Audio Amplifier Board Class D Dual-channel 85wx2 Stereo Audio Amplifier Module Product Category:Class D stereo amplifierOperating voltage: DC7-30VOutput power: rated power 2x85W(4ohm)Load can be connected to 3/4/8/16 ohm speakersMaximum power 2 * 105W (4ohm)Performance indicators:Efficiency: 92%Total harmonic distortion plus noise: Less than 1%Gain: 34dbLow quiescent currentNoise suppressionProtection function:Power input reverse protectionOvercurrent protectionOverheat protectionUnder-voltage/over-voltage protectionInput mode:3.5mm audio input,3P_2.54mmWiring terminal audio inputIndicator status:(I) power normal operation(2)alarm sound distortion(3)error trigger protectionblackColour:blackMaterial:plasticPackage Contents:1 x Amplifier BoardOnly 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.