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Output Impedance - Output Impedance: 4/6/8/16 ohm speakers are supported (8 ohms would be best); Output power: add the front-end circuit 5532 to ensure high output. With DIP switch design - Equipped with the DIP switch, it can be adjusted directly after the gain gain and allows a stronger attenuation horn that can drive speakers with higher impedance. Power supply & audio input power supply: 2.1 interface 8 ~ 25V DC power supply; if polarity is incorrect, the chip will burn off. Audio input: CSR8635 Bluetooth chip, Bluetooth V4.0 stereo input, various versions of Bluetooth connection Keenso Guarantee - High quality TDA7492P receiver amplifier, 100% test before shipping, warranty for a long time, fast money refund and perfect customer service! Simply connect us via QA & email for questions! TDA7492P Power Amplifier Chip - This is an upgrade version with chip TDA7492P. Power supply: 2.1 interface 8-25V DC power supply. Designed for optimizing circuit layout that provides excellent sound output and high performance.