This AC DC adapter 21V 5A is built with the latest power supply technologies and the quality components materials to enable high performance. The ac adapter power adapter features high average efficiency and excellent standby power consumption. It provides low power dissipation in standby mode by disabling the start-up circuit. The IN2105000 is a safety mark ac adapter certified to UL/CSA/IEC/EN 60950-1 and carrying the CE mark for the Low Voltage and RoHS Directives. The family of AC DC adapter 21V includes AC DC adapter 21V 1000mA and 21V 400mA AC DC adapter work in constant current/constant voltage primary-side regulation(PSR-CC/CV).