Product description NWANSI DC 12V to 3V/ 3.3V / 3.7V / 4.2V /5V/6V/ 7.2V / 8.4V /9V Step-Down Power Converter Product Description No isolation between input and output. Aluminum shell, epoxy potting. Natural air convection cooling. High efficiency, life span up to 100, 000 hours. Low voltage, overload and overheat protection.