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Large heat sink chip mounted on the surface of the amplifier module; the heat sink is equipped with an array construction that is lighter for heat dissipation DC12-26V 80Wx2 + 100W 2.1-channel audio amplifier board; great for DIY sound system, high-power broadcast, home cinema, play music on the street/square/shopping mall sound to amplify TPA3116D2 chip with > 90% power efficiency and low idle loss characteristic; With comprehensive short circuit protection; over temperature; over/less voltage; DC current; Product description Features: Operating voltage: DC 12-26V (recommended 24V more than 3A power supply) Output power: 80W + 80W + 100W Output resistance: 4-8 ohms. Chip: TDA3116D2 Frequency response: 14-100KHz Switching frequency: 1.2 MHz. Signal-to-noise ratio: 100dB Package includes: 1 x Audio Amplifier Card; Product description Features: Operating voltage: DC 12-26V (recommended 24V more than 3A power supply) Output power: 80W + 80W + 100W Output resistance: 4-8 ohms. Chip: TDA3116D2 Frequency response: 14-100KHz Switching frequency: 1.2 MHz. Signal-to-noise ratio: 100dB Package includes: 1 x Audio Amplifier Card; Features: Operating voltage: DC 12-26V (recommended 24V more than 3A power supply) Output power: 80W + 80W + 100W Output resistance: 4-8 ohms. Chip: TDA3116D2 Frequency response: 14-100KHz Switching frequency: 1.2 MHz. Signal-to-noise ratio: 100dB Package includes: 1 x Audio Amplifier Card