Voltage detector DIY Prototype

My current voltage detector project is a PCB prototype project which aims to test the device and detect the current of the cable and the electrical socket.

The design of the device was designed with a little bit of support, it requires financing for this PCB prototype,

I am a hobbyist interested in design and construction of devices and PCBs as well as robotics and programming.

The prototype PCB shown needs your support and financing.

How the voltage detector design works is based on the Timer555 module and has components such as 2 capacitors, a buzzer, a resistor and 2 LEDs. The prototype is powered by a 9V battery, the design deserves 12V.