Question about HM24 Gaming-PC HM247793 (AMD Ryzen 7 5700X3D / 32GB RAM / 1TB SSD / RTX 4060 Ti 8GB / Win11 Pro)

The PC is equipped with a 550-watt power supply unit. Unfortunately, the manufacturer does not specify a specific motherboard model, only the chipset (AMD B450) and the format (mATX).

And I would also like to know which mainboard it is and how many volts the power supply has*.