Step:

1. The parts we need in this project.

2. Some steps to make this circuit.

3. Test the buzzer, then add the led to test the indicator.

Components list

(1.) 12V Relay  https://www.utsource.net/itm/p/1870494.html

(2.) Capacitor 25V 2200uf  https://www.utsource.net/itm/p/9509010.html

(3.) Capacitor 25V 1000uf   https://www.utsource.net/itm/p/9506441.html

(4.) Buzzer   https://www.utsource.net/itm/p/8027891.html

(5.) Resistor 220 Ohm  https://www.utsource.net/itm/p/6491244.html

More details, pls check the video on Youtube: