Features: 12V Battery Undervoltage Controller: This is a 12V battery undervoltage controller designed to provide undervoltage protection for 12V batteries. Set an undervoltage threshold and a startup voltage. When the battery voltage drops below the undervoltage threshold, the module automatically disconnects the load; when the battery voltage rises above the startup value, the module reconnects the load. Includes a memory retention function. Features a digital display for real-time voltage monitoring. Equipped with undervoltage setting and startup setting buttons for easy operation. Built-in delay function: the load disconnects only after the voltage remains below the undervoltage threshold for 6 seconds, preventing false disconnections. Specifications: Product Name: 12V Battery Controller Power: 20A relay Dimensions: 82x42mm Installation Size: 94mm Operating Temperature: -25 ~ 85 Operating Humidity: 5%~95% RH Note: Please allow 1-2cm measurement deviation due to manual measurement. Due to differences between monitors and lighting effects, the actual color of the item may vary slightly from the images shown. Thank you! Package includes: 1 x Battery Controller