Features: Adopting TPA3255 chip, sound power core, high efficiency, low power consumption, high definition sound quality, and comprehensive protection mechanism. With protection function, reverse power protections is safe. Easy to use, independent tuning of high and low frequencies, more convenient to use. Low loss, using digital amplifier specific inductors for lower losses. Multiple decoding option, supporting wireless sounddecoding and USB flash drive decoding. Specifications: Component:PCB Color:Black Size:Approx.124x124x44mm/4.88x4.88x1.73inch Product Model: XY-AS21HPA Power supply: DC19-51V/10A or above Left and right channel output power: 30W+30W @ 8Ω/24VDC 70W+70W @ 4Ω/24VDC 80W+80W @ 8Ω/36VDC 160W+ 160W@4 Ω/36VDC 160W+ 160W@8 Ω/50VDC 300W+ 300W@4 Ω/50VDC Subwoofer output power: 30W @ 8Ω/24VDC 70W @ 4Ω/24VDC 150W@2 Ω/24VDC 80W @8Ω/36VDC 160W@4 Ω/36VDC 350W@ 2Ω/36VDC 160W@8 Ω/50VDC 300W@4 Ω/50VDC 600W@ 2Ω/50VDC This model is designed with 2 original imported TPA3255 amplifier chips, with doublel cores for greater stability. TPA3255 is a high-performances D-class power amplifier that have D-class efficiency and can deliver truly high-end sound quality. The device features advanced integrated feedback design and proprietary high-speed gate driver error corrections function. This technology enables devices to maintain low distortion across the entire sound frequency band while showcasing high definition sound quality. Package Includes: 1pcs Digital Amplifier note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind befores you order. 2.Due to the differences between different monitors, the picture may not reflect the actual coloring of the item. Thanks for your understandings.