V-Guard iD4 Dura 2040 Voltage Stabilizer for up to 1.5 ton Inverter AC (Working Range:160 to 280 VAC

Amazon Buy Link - amzn.to/3ZrNcFh
V-Guard iD4 Dura 2040 Voltage Stabilizer for up to 1.5 ton Inverter AC with Digital Display (Working Range:160 to 280 VAC) (Grey)
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is it copper winding ????