A 5V to 12V USB power boost cable is a, typically, 1-meter, regulated converter that enables powering 12V DC devices (up to ~1A) using a 5V USB source, such as a power bank or phone charger. It features a USB-A or Type-C input and a 5.5x2.1mm DC barrel output, commonly powering routers, LED lights, and cameras during power outages