Feature:1. Includes 10X preamp tone board as well as treble, mediant, bass and volume control.2. Selection premium electronic components, adopt NE5532 operational amplifier, high quality potentiometer,for black BP Promise coupling capacitor, 1% metal film resistor, capacitors, etc.3. With op amp IC socket, convenient to upgrade for flexible use.4. Reasonable circuit board layout, small noise, beautiful component layout.5. AC 12V-18V dual power supply voltage.Specification:Item Type: NE5532 Preamplifier Tone BoardSupply Voltage: Dual Power Supply AC 12V-18VNumber of Channel: Dual ChannelAdjustment Type: 4 channels (Treble, Mediant, Bass, Volume)Audio Input:For RCA socketAudio Output: 3P terminalInput Voltage: 3P terminalPCB Size: 112x68x23mm / 4.41x2.68x0.91inInstallation Size: 98.5x47.5mm / 3.88x1.87inMounting Hole: 3mm/0.12inNote: Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.Package List:1 x NE5532 Preamplifier Tone Board4 x Gasket4 x Knob4 x Nut