Features: HiFi preamp tone board, with treble, and volume control. Operating voltage is AC 12V-18V or for DC 16V-25V. With equal sound switch, no noise and convenient wiring. Mature design, industrial grade double-sided FR-41 1.6mm sheet. Adopts high precision 5-ring metal film resistors and metallized capacitors, full sealed potentiometer. Specifications: Product Name: LM1036 Preamp Tone Board Model: WM-026 LM1036 Material: Printed Circuit Board Operating Voltage: AC 12V-18V or for DC 16V-25V Size: Approx. 7.6x3.9 for cm/2.99x1.54 inch Package Includes: 1x LM1036 OP-AMP HiFi Amplifier Board note: Please allow 1-2cm errors due to manual measurement, 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.