Features: Protections mechanism: overvoltage, undervoltage, overheating, DCdetection, short circuit protections prompt: Only when this sound input is sufficient and the power supply voltage/current is sufficient, can there be sufficient output power. High power supply voltage will result in high relative power, and speakers with different impedances will have different output power. When the voltage and current are sufficient, the larger the number ofohms of the speaker, the smaller the relative sound power. Please pay attention. Power voltage: 12V 8ohm speaker/12W (left channel)+12W (right channel), 4ohm speaker/20W+20W 15V 8ohm/18+18W, 4ohm/greater than 30+30W 19V 8ohm/32+32W, 4ohm/greater than 45+45W 24 8ohms/38+38W, ohms/greater than 55+55W. TPA3116D2 is Class D power amplifier ICwith very high performances parameters. The maximums modulation frequency can reach 1.2MHz, and the distortion of high-power output is less than 0.1%. It has two sound input methods, AUXand Blue tooth, in one; The potentiometer adjusts the volume with a switches. Equipped with filtering inductance, the sound is round and clear. Adopts brass connectors and fence type terminals, which can withstand large currents, do not generate heat, do not damage wires. Specifications: Style: bare board/with housing(optional) Chip solution: TPA3116D2 (with AM interference suppression function) With or without filter: Yes (the filtered sound becomes smoother and clearer) Adapted power supply voltage: 5-27V (optional adapters such as 9V/12V/15V18V/24V, high voltage recommended for high-power) Adapted speaker: 30w~200w, 4/8Q channel count: left and right double channels Blue tooth version: 5.0Blue tooth transmission distance: 15 meter (unobstructed) Package Includes: 1xDigital Amplifier Board note: Please allow 1 to 3cm error due to manual measurement, please make sure you do not mind before you bid, Due to the difference between different monitors, the picture may not reflect the actual color of the item.