Now with Long Life Capability Engineered for 20+ Year Life in Normal Paging Service. -24Vdc, Digital, Filtered, Switching Power Supplies – Smaller Footprint – Barrel or Wire Connection – Wall, Rack/Rail Mount, Mounting Bracket Included – 4 Amp Unit also Includes Low Energy, Screw Terminal Connecting Block – 100 – 240 V – UL/C & CE – Less Energy/Less Heat