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The automatic transformer adjusting household "ARB-400" from I quarter of 1989 produced Production Association "Elvo". The autotransformer serves to manually maintain a relatively stable voltage of 220 volts with slow changes in the voltage of the electrical network from 150 to 250 volts with a load power of up to 400 watts. The indicator voltage of 220 volts are extinguished LEDs. If the mains voltage is less than normal, the left LED lights up, the right LED is larger. The autotransformer can be used to power any electronic and radio television equipment.