Features: The resistors is selected as highprecision SMTresistor, and the maincircuit adopts metal film resistors with accuracy of ±1%, ensuring a signal-to-noiseratio of the entire machine. The 1.6mm thick doublesided board, 1.5A thick coppers, and fully tinsprayed to ensure good current passing performances. Adopting a fully enclosed dust-proof potentiometer, the performances is more stable and more wear resistant than ordinary potentiometers. Usings a redness highcurrent inductors to ensure clear and powerful sound. Upgraded your sounds system with the Amplifiers Board and experiences good stereoperformances. Specifications: Material:ABS Working mode: Class D Staticscurrent: 50mA Work efficiency: 90% Output power: 2x 50W+100W Frequency response: 20Hz to 20KHz Working voltage: DC18V to DC24V Maximums output current: 4Amp Size:Approx.100mm/3.94''x83mm/3.27'' Package Includes: 1Set Power Amplifiers Board note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color.