Now with Long Life CapabilityEngineered 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