Features Volume Adjustment: The volume can be adjusted at will as needed, this audio power amplifier card is very convenient to use. Stable Performance The power amplifier board adopts excellent components, ensures long-term stability. Wide Use This audio amplifier board can be widely used in store solicitations, home theater, square speakers, etc. 【Large Capacity】Double row symmetrical capacitors, large enough in capacity and quantity, with perfect filtering effect. Easy Operation The power amplifier board has a wide range of applications, convenient to use, compact size, easy to install. Specification: Item Type: Audio Amplifier Board Material: Board Resting current: 25mA. Voltage: DC 5V-12V Horn Impedance: 4-8ohm Output power: 15W (maximum 18W) Total Harmonic Distortion: 0.08% (Po=0.114W, RL=4ohm) Signal-to-Noise Ratio: 94-106dB (1-15W) Heating capacity: the higher the supply voltage, the larger the volume and the higher the heating capacity. (Please add heat sink for high power supply) Operating temperature: -25°C to 85°C Operating Humidity: 5% to 95%RH Package list: 1 x Audio Amplifier Card 1 x gasket. 1 x nut. 1 x Accessory Package List 1 x Audio Amplifier Board 1 x Gasket 1 x Nut 1 x Accessory