Specific parameters:Model: 1969 Small Group A Tube Model: TIP41C Output power: 5W per channel Power consumption: 20W per channel Power source: DC single 12-30V Static current: prior to shipment in a standard 25 volts DC down to 0.8-0.9A Board size: 5 x 5cm/1.97 x 1.97 inch Thickness: 1.6mm fiberglass board double-sided design Board material situation: Resistance: full five-color ring precision metal film resistors Adjustable resistance: Sealed multi-turn adjustable resistors Input capacitance: Promise of capacitance Electrolytic capacitors: high-capacitance Specific wiring methods: 1969 finished panels and audio speaker power wiring diagram. material:plastic colour:green Package Included: 2x DC 12V 1969 Class A Amplifier Board 4x Thermal insulation pads 4x insulation caps Only the above package content, other products are not included. Note: Light 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.