The DMS-20LCD-0-DCM-C is a 2-wire self-powered LCD display DC Voltage Monitor for battery-powered systems. The self-contained DC voltage monitor set new standards for quality, performance, size and cost. Simply apply power to the two rear terminals and the unit is operational. No additional components are required. The 0.37-inch/9.4mm large LCD display with built-in VDC annunciator, can be easily read from 10 feet. Reverse polarity protection is standard on both models. The DMS-20LCD-DCM utilizes a precision analog-to digital converter and ultra-stable passive components to achieve excellent performance over the operating temperature range of 0 to +60°C.