Professional 48V phantom power
48V phantom power is a direct current (DC) voltage sent through standard 3-pin XLR audio cables to power studio condenser microphones, active DI boxes, and stage electronics without needing a separate battery
The voltage is split equally and sent down the balanced audio signal conductors (pins 2 and 3) relative to the ground shield (pin 1), meaning it is completely "invisible" to standard dynamic microphones that do not require power.