The 0.56 Inch Mini Digital DC Voltmeter is a compact 3-digit LED voltage display module designed for real-time monitoring of DC voltage in electronic projects, battery systems, power supplies, vehicles and DIY applications. It features a bright 0.56-inch LED display available in red, green or blue, providing clear voltage readings at a glance. With a measurement range of approximately 4.5V to 30V DC, the meter is suitable for monitoring common 5V, 9V, 12V and 24V DC systems. Depending on the selected version, the voltmeter may use a 2-wire or 3-wire connection. The 2-wire model takes its operating power directly from the voltage being measured, while the 3-wire version provides separate power and voltage-sensing connections for greater flexibility.