HIFI Perfect SoundAdopt TPA3116D2 Class D chip, distortion is less than 0.1% even under high power operation, modulation frequency up to 1.2MHZ. The built-in filter capacitor can filter out the noise to make the voice more clear. AUX and Bluetooth InputWith two audio input modes, you can connect directly with wireless Bluetooth 5.0 or choose the headphone input (AUX). You can freely control the module within a range of 15 meters. Dual ChannelThis stereo audio amplifier module works with DC 5V-27V and 4/8 ohm 30W-200W speakers ( recommended 30W-50W). Please note that sufficient input voltage and current are required to ensure sufficient output power. Protection functionThis BT amp with protective shell, supports connection protection reverse, over voltage protection, under voltage protection, over temperature protection, short circuit protection. ApplicationPotentiometer adjust volume with switch for easy volume control , the ideal result for DIY speakers. The TDA3116D2 is expanded in store solicitation, home theater, square speakers, etc.