Product description NWANSI Mini DC 12V/24V to 5V 3A/5A/10A/15A DC Power Converter Product Wiring Instructions The input terminal is connected to the positive "+" terminal of the power supply. The input terminal is connected to the negative "-" terminal of the power supply. The output terminal is connected to the positive "+" terminal of the device. The output terminal is connected to the negative "-" terminal of the device.