DUAL Electronics Corp. Heathrow. FL 32746 4/3/2 Channel Power Amplifier 600 WATT Bridgeable PWM MOSFET power supply Red/Silver/Black RMS POWER OUTPUT @14.4 VDC 12VDC NEGATIVE GROUND Design by Dual Made in China MODEL XPA4100 SERIAL No. NSA080 5027090 TECHNICAL ASSISTANCE 1-866-626-7863 A great deal of information on www.dualav.com Owned by my late son.