power supply adapter:

A 12V 500mA Power Supply Adapter Charger is a device that converts AC (alternating current) electricity from a wall outlet into DC (direct current) electricity at 12 volts with a maximum output current of 500 milliamps (0.5 amps). It is commonly used to power small electronic devices such as routers, modems, certain types of LED lights, and various other low-power devices that require a stable 12V DC power source