A USB power boost cable (5V to 12V/9V) is a DC-DC converter adapter that steps up voltage from a USB source (power bank, car charger) to a higher voltage, typically for powering 12V devices like routers, modems, or LEDs. These, often called Step-Up Module Cables, generally feature 5.5x2.1mm plugs, integrated IC circuits for safety (over-voltage, short-circuit protection), and are ideal for portable use or power outages.
