Description: 1. This is with the preamp process, bass splitter. 2. with bass, left and right channel volume adjustment, treble adjustment, total control potentiometer volume 2.1 POWER AMPLIFIER 3. with 12-24 V DC power supply, maximum support of 50 W (left channel) + 50 W (right CH) + 100 W (low CH) Three channel output. 4. Great operating voltage, energy-saving design, efficiency of up to 90% or more. 5. Design of shock protection boot, start without sound burst. Specifications: Core Chip: TPA3116D2 Operating voltage range: DC 9-25 V (current 3-4 a or more, as the need for more recommended power 19-24 V / 4-5A above) Audio input sensitivity: 500-800mV Frequency response range: 20Hz-20 KHz Speaker impedance: Loudspeaker L / R CH 3.5-8 Bass speaker: 2-8 Maximum output power: 50 W (left channel) + 50 W (right channel) + 100 W (under CH) Size: approximately 101mm x 100mm x 30mm / 3.97x3.94x1.18 " Note: There may be a difference of 1 to 3mm due to manual measurement. Due to different screen and different light, the picture may not show the actual color of the item. Thanks for your understanding. Package Included: 1PC*TPA3116 2.1 50Wx2 + 100W DIY Digital Amplifier Board 12-24V Super Bass Module(Not Bluetooth)