HAYDON12VDC3ASwitch Mode Boxed PSU With 13.8V Battery Backup Model：HAY-PSU12V3ABBL (Large Clam Box) Features： High efficiency, cost effective power supply. Ideal for use in Intruder, Access Control and General Security applications. Universal mains input voltage 90-264Vac. Max. 3Acurrent to load. Max. 0.5A to charge standby battery. High efficiency electronics for reduced running costs and lower operating temperature. Installer safe design with all high voltage electronic fully shrouded. Full electronics short circuit and overload protection on load output under mains operation. Mains transient protection. Lid open & REAR anti vandal tamper detection. An optional integrated output module allows multiple circuits to be individually fused (Depends on box size). Green Mains present LED. Red Fault LED.