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over voltage protection

Castle Knight 2 Speakers
  1. K

    Economical Voltage Window Protector and Spike Guard

    How about a reliable over/under voltage protector for av and other appliances ..! well here it is ...:)Recently i have purchased "Su-kam Power Dock" It has over voltage /under voltage,surge,powerline spark,frequency protection...huh! some features: ON-DELAY-RELAY: The device is...