Overview This product is designed for DC power supply applications, requiring an input voltage of 4–28V. The red wire connects to the positive terminal and the black wire to the negative terminal. Its standout feature is an integrated reverse-connection and anti-burnout protection circuit, which prevents damage caused by incorrect wiring during use. Important reminder: Never connect to AC 220V power. Product Details Compatible with DC power supplies from 4V to 28V. Equipped with reverse-polarity and overload protection to safeguard against operational errors. Clear wire designation: red for positive, black for negative. Designed for safe and reliable low-voltage DC use only. Key Features 1. Wide Voltage Range – Supports DC input from 4V to 28V for flexible application. 2. Reverse-Connection Protection – Built-in circuit prevents damage if wires are connected incorrectly. 3. Anti-Burnout Design – Protects the product from overload and short-circuit conditions. 4. Clear Wiring Setup – Red and black wires ensure simple and correct installation. 5. AC Incompatible – For DC use only; must not be connected to AC 220V power. Display Description When the temperature sensor is disconnected, the digital display will indicate the disconnection or show an error state, depending on the product’s design.