Module function:The user can select one of the following four functions by pressing the button. The delay time can be by adjusting the potentiometer. The delay time T1 can be adjusted between 0.1 second and 120 seconds. Function F1:Power-on delay pull-in: After the delay of T1 from the start of power-on, the relay pulls in and sends a high-level pulse signal to the X1 interface at any time. This function resets and restarts. Function F2:The power-on delay is disconnected: the relay is closed when the power is turned on. After the T1 time is closed, the relay is disconnected, and a high-level pulse signal is given to the X1 interface at any time. This function is reset and restarts. Function F3:Self-locking relay mode: a high-level pulse signal is sent to the relay X1 interface, the relay is closed, and a high-level pulse signal relay is turned off. Function F4:Level trigger mode: When the power is turned on, the relay is disconnected, and a high level signal is sent to the X1 interface. The relay immediately picks up. After the X1 port signal disappears, the relay still pulls in. When the pull-in time T1 arrives, the relay turns off. Features: 1. With delay pull, delay open, self-lock and trigger delay function; 2. With power supply anti-reverse function, connecting the reverse power supply will not damage the module; 3. Working voltage: 24V 4. The timing can be arbitrarily set between 0.1 seconds and 120 seconds; 5. The parameters can be saved, and the setting contents are not lost. Colour:As shown Material:ABS Size:60*35*20mm Package Contents: 1 * delay relay module Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.