Fosi Audio V1.0B 2 Channel Stereo Amplifier Mini Hi-Fi Class D Integrated TPA3116 50W x 2 in excellent shape,clean and fully functional. Comes with power adapter. Fosi Audio V1.0B mini stereo amplifier includes highly efficient, fully integrated, digital, class D audio amplifier ICs based on NEW amplifier technology, supporting a supply voltage range from 12 V to 24 V, allowing it to be used across home and professional audio applications. V1.0B 2-channel class D amplifier adopts 2PCS Texas Instruments TPA3116D2 chip. The TPA3116D2 are stereo efficient and digital amplifier power stage for driving speakers, with advanced oscillator/PLL circuit employs a multiple switching frequency option to avoid AM interferences. High-performance effectively improve output power and audio quality. Advanced circuitry design, built-in speakers protection circuit, solid aluminum chassis, the home Hi-Fi integrated amplifier create clear and clarity sound, no audible noise, dead silent when nothing is playing through it. V1.0B stereo audio amplifier with very low power loss under all operating conditions. The ultrahigh power efficiency and cool operation make the V1.0G suitable for use in home audio systems.