1. High-End Pure Black Immersed Gold Circuit Board, Kemet Audio Capacitors, Dual Imported Nichicon Large-Capacity Filter Capacitors Per Channel, Stone Filter Capacitors And Metal Film Resistors. 2. TDA7377 Digital Power Amplifier Board Module 3. Two-Channel Stereo 12V 4. 30W * 2 Diy Audio Power Amplifier 5. Professional Installation Is Required To Avoid Product Damage. 1. Power Supply Voltage: DC 12V 2. Output Power: Can Be Connected To 4-8 Speakers, Maximum 2*35W Stereo (18V 4) 3. Input Method: 3.5mm Audio Input / 3p Expansion Input Port 4. Protection: Power Input Reverse Connection Protection, Short Circuit, Overcurrent, Overheating 5. Size: Pcb Size: 58.67X55.12mm; Potentiometer Handle Opening: 7mm; Overall (Including Heat Sink): (Length*Width*Height) 90.56x55.12x26.65mm 6.Colour:black 7.Material:PCB Package Contents: 1 x Digital Power Amplifier Board Module 1 x 3p 2.54 Audio Cable Note:Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Will Not Affect The Use Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.