The 2-Wire LED Digital DC Voltmeter & Battery Capacity Indicator is a compact, plug-and-play panel gauge designed for real-time battery voltage and capacity monitoring [Makersbd]. Operating via a simple 2-wire setup, it features a crisp 3-digit red numerical voltmeter paired with a multi-segment color battery bar graph that updates instantly based on charge levels. With its built-in reverse-polarity protection and an auto-detecting voltage design (supporting 12V up to 60V systems), it is the ideal dashboard tracking module for electric bicycles, cars, motorcycles, golf carts, and custom solar power arrays.