1. High Performance Preamp: With 10x preamp amplification, NE5532 op-amp and separate controls for treble, bass, volume, this preamp delivers an exceptional audio experience for professional-grade , control circuits, and telephone channel amplifiers. 2. Premium Components: The preamp is built with carefully components including high-value NE5532 op-amps that offer better noise performance and excellent output driving capability, high-quality small-sized potentiometers, BP infinitely coupled capacitors, 1% metal film resistors, and more. 3. Flexible and Upgradable: The preamp kit comes with an op-amp IC socket which makes it easy to replace and upgrade as per your preferences. 4. Stable Audio Output: The preamp uses high-quality potentiometers with good and stable audio output, making the audio experience enjoyable and free from disruptions. 5. Wide Compatibility: The preamp operates on a dual power supply of 12-24V AC and supports input via dual plugs, making it compatible with high-quality and professional sound equipment, as well as telephone channel amplifiers. Working voltage: 12-24V AC dual power supply (12V-0-12V 24V 0-24V) Power consumption: 5W Front chip: NE5532 Input interface: Output interface: 2.54-3P Number of channels: Dual channel audio Adjustment type: 4-way (treble+mid range+bass+total volume) PCB board size: About 105x54x23mm/4.13x2.12x0.91inch Colour:Photo Color Material:ABS Package Contents: 1 set of front mixing boards 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.