It is a relay module with high , stable and reliable performance.It support reverse input protection and comes with a trigger button switch. Power on and press the trigger switch to turn on load, and turn off load after delay time. The time range is from 1 second to 10 seconds adjusted by potentiometer if you need longer time, simply replace a larger capacitor or potentiometer. Widely used on operating equipment, robots, intelligent product development, automation equipment, PLC development, smart home anti-theft alarm delay, electronic development, etc. With diodes to prevent reverse power connection, you can connect the wires with confidence. Specifications: Working Voltage: 12V Load Capacity: 10A 250VAC, 10A 30VDC Colour:blue Material:PCBandComponents note:The buttons on the cable are random colors, don't accept the specified color Package Contents: 1 x Module 1 x cable Only the above package content, other products are not included. Note: Light reflection 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.