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DC-DC CC CV Buck Converter Volt Step Down 12V 19V 24V Car Laptop Power Supply Module 7-40V to 1.2-35V 8A 300W with LED Indicator, US $ 2 - 2.7 / Piece, Guangdong, China, OriginalBrand, 8A 300W Buck Converter.Source from Shenzhen Rainbowsemi Electronics Co., Ltd on Waimaotong.com.