For screen sizes up to 27 inches, power can be supplied via PoE. PoE combines power and data connections through a single cable, making installation simpler and more cost-effective. It provides reliable power supply and increased safety by using low voltage cables. Additionally, PoE simplifies maintenance and allows for scalable expansions without complex wiring. This makes PoE an efficient, safe, and cost-effective solution for integrating screens in elevators, enhancing the reliability and operational efficiency of critical building management systems.