Output of the external power source shall complied with ES1 and ES2 requirements, output rating 10-30
Vdc, minimum 12W ( DC Jack or POE injector ), with minimum ambient temperature 65 ℃, altitude =
5000m , and evaluated in accordance to UL/EN/IEC 60950-1 and / or UL/EN/IEC 62368-1
Ensure to connect the power cord of power adapter to a socket-outlet with earthing