100% brand new and high qualityWith original TPA3116 NE5532Main circuit electrolytic capacitor signal from Taiwan brand、 the main filter capacitor capacity electrolytic capacitor using a dedicated 3 * 3300UF、 other imported Siemens、 ensure strong support for a steady stream of power.Use high-precision chip resistors resistance、 the main circuit employs a precision of ¡À 1% metal film resistors rings、 ensure the machine a good signal to noise ratio.1.6mm thick sheet using double-sided PCB、 1.5 oz copper thickness、 HASL whole process to ensure that the size of the current through the good performance. PCB-class quality.Fully enclosed dust-proof potentiometer、 the performance is more stable、 more durable than ordinary potentiometer.Use red ring high-current inductors、 to ensure crisp and powerful sound.The most perfect 2.1 digital amplifier board.The basic performance parameters:Work modle: class DQuiescent current: 50mAWork efficiency: 90%Rated output power: 100W+2*50WFrequency response: 20Hz to 20KHzWorking voltage: DC18V to DC24VMaximum output current: 4APCB SIZE£º(L*W)10.00*8.25cm/3.94"*3.25"Potentiometer function: switch from left to right around 1. channel volume 2. Volume 3. Bass Master VolumeQuantity:1PcNote:Size for manual measurement、 there may be a 0 to 2 cm error、 belongs to the normal phenomenon.And due to the difference between different monitors、 the picture may not reflect the actual color of the item. Thank you!