Dual Hifi-grade TPA3116D2 ChipsThis amplifier board features two TPA3116D2 chips, offering a wide voltage input range: DC 9-24V, with a peak output of 100W+100W @ 1kHz, 21V, 4-ohm speakers. Multiple Input MethodsThe amplifier board supports various input methods, including Bluetooth input, 3.5mm AUX input, USB input, and more. It is compatible with a wide range of devices such as smartphones, tablets, laptops, MP3 players, etc. You can easily switch between your preferred audio input methods.