Features: TPA3116D2 has AM interference suppression function; the output has a filter, HIFI sound quality, and the requirements for speakers are relatively low. 2.1 dual-channel stereo output, maximum output power 2X50W, with pre-stage high and low adjustment; pure HIFI fever sound quality. The treble is pure and transparent, the midrange is gentle and delicate, and the is surging and shocking. Supported audio input: Bluetooth-compatible 5.1, AUX, USB sound card, U disk. (U disk file system must be FAT 32, maximum support 32GB). The main knob adopts the rotary encoder only used in high-end power amplifiers, and realizes 360-degree stepless tuning. The hand feels smooth, one-button start and stop, and the operation is simple and convenient by long-pressing the switch. for Protection mechanism: over voltage, under voltage, over temperature, for DC detection and short circuit for protection. Specifications: Material:Plastic+PCB Product model: XY-E100H Power supply: for DC 9-24V/5A or above Bluetooth-compatible Version: 5.1 Audio Channel: 2.1 channel Audio Input: Bluetooth-compatible+AUX+U Disk+USB Sound Card Audio Output: Left and Right channels + subwoofer Frequency range: 20HZ--30KHZ Note: Please allow 1-2cm errors due to manual measurement,pls make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x E100H Bluetooth-compatible Audio Amplifier Board