This board is basic 12V delay on timer.
How it works?
After power on the board at an input, board will delay 1-3s and then pass the power from input directly to output. Example application. It is used to delay the control signal which is sent from Car radio font panel to power amp. To prevent spike go to the speaker when user power on the car audio system. The Car radio font panel and pre-amp have be turned on and ready first, then followed by power amp User can apply to use with other application which need some delay between 2 circuits.
•  Require 12-15VDC
•  Relay on board can handle 5A at 12VDC
•  Box size : 3.3cm x 5.0cm x 3.0cm ( Height )
•  Delay time adjustment by Pot on board 1-3second, default at 1s
•  Current consume 36mA
•  Comes with the schematic and wiring diagram
Example of an application
•  You want to turn off the light in your kitchen/Car ceiling light but don't want the light to off immediately but need to keep turn on 3 minutes and then automatic off immediately which is enough times for you to walk out off the kitchen / or far away from your car.