Features: Intelligent sound 28dB 38dB two gears can be selected,clear sound amplification. 200W/ or 2CH 100W+100W input reverse aganist connection,powerful sound output. Voltages support DC10-30V It is recommended to use power supply with voltages DC24-30V and current 10A or more. The higher the voltages, the higher the output power can be Never connect alternating current power, or it will burn out! Suitable for auditory enthusiasts, engineer and music producer and other users who have highly requirements for sound quality. Can be used in home theatre , car Auditory, stage performances and recording studios, etc., bringing users excellent Auditory experience Specifications: Product Name: 100W+100W Double Channel/200W Post Amplifier Board Amplifier chip: original TPA3221 Product Model: Adaptable power supply: working voltages DC10-30V, limit 31V Size:about 95x60mm/3.74x2.36in Package Includes: 1PC Digital Power Amplifier Board note: Please allow 1-2cm errors due to manual measurement,please make sure that you do not mind before order. Due to the differences between different monitors, the picture may not reflect the actual color.