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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 ± 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：(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!