PRESET WITH 4 FUNCTIONS: The timer delay module is preset with 4 functions: delay ON, delay OFF, self-locking and trigger delay function, so as to meet various application needs. ANTI-REVERSE FUNCTION: The module is also characterized by its power supply anti-reverse function, capable of preventing damages to the module. SETTABLE DELAY TIME: The delay time can be arbitrarily set between 0.1 seconds and 120 seconds. NO LOST PARAMETERS: The parameters can be saved, and the setting contents are not lost when the module is powered off. STABLE APPLICATION: High-quality components, stable performance and simple operation, widely used in a variety of control situations that require delay self-locking. Product Description Specification: Working voltage: DC 5V, 12V, 24V (Optional) Working current: