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This 180W switching power supply strictly follows Lite-On original PA-2181-1 specification, cross replaces multiple OEM original PSU including HK280 series and PCE027/PCE028 models, exclusively engineered for specified Lenovo desktop series. High-efficiency circuit layout cuts standby power consumption and reduces daily electricity cost, stable single +12V rail supplies reliable power for office-grade CPU, onboard graphics and multi-HDD storage configuration. Standard ATX compact dimension matches original chassis mounting hole, ideal spare replacement part for enterprise PC fleet maintenance, POS machine refurbishment and desktop upgrade repair projects.