Features: Adopts power amplifier chip TPA3116D2, with high-fidelity stereo sound. 3-Channel left channel right channel subwoofer, 2x50W+100W output power. The power filter capacitor adopts two 4700UF large pond electrolysis, high temperature, low resistance and long life; high-efficiency inductance of red and gray ring audio output, which has good high frequency extension, high efficiency and no heat. A variety of audio input methods, on-board bluetooth-compatible 4.2 receiving module, or input audio from 3P socket, to meet the connection of different modules, support super cutoff frequency adjustment (cutoff range 180Hz-250Hz). Dual power supply mode, support single power supply for DC 24V power supply, or AC 18V power supply (need to add rectifier filter circuit), with its excellent performance and comprehensive cost performance, it is widely used in home theater, KTV, stage speakers, etc. Specifications: Product Name: 3-Channel Bluetooth-compatible Audio Amplifier Moudle TPA3116D2 BLE Version: BT4.2 Operating Voltage: 22-26VDC ( Recommended DC24V 5-10A ) Output Impedance: Subwoofer 2-8 Ω , Left and Right Channel 4-8 Ω Output Power: Subwoofer 100W (24V/3Ω) , Left and Right Channels each 50W (24V/4Ω) Input resistance: 20KQ Signal input: 800-1500mV P-P Frequency response: 20Hz-20KHz (±3dB) 20-250Hz (subwoofer) Distortion: Subwoofer <10%, Left and Right Channel <1% Material: Metal, Printed Circuit Board Size: Approx. 100x92x38 mm/3.93x3.62x1.49 inch Package Includes: 1 Piece TPA3116D2 Subwoofer Amplifier Board note: Please allow 0-1cm error due to manual measurement. pls make sure 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.