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If you want to max out your power potential, the 400-watt Z-4000 is the most powerful transformer to receive the UL-Listing for the model railroading hobby. The Z-4000 has two separate throttles to let you power two different tracks, and it has two fixed power outputs you can use for operating accessories. A single Z-4000 will power a lot of layout! Product Features: •U.L. Listed to U.S. & Canadian Standards •Pure Sine Wave Power Signal •(2) 21 Volt Variable Track Outputs •(1) 14 Volt Fixed Output •(1) 10 Volt Fixed Output •Internal Cooling Fan •On/Off Power Switch •Power and Overload Indicator Lights •Compatible As A Power Source For All O Gauge AC-Powered Locomotives & Accessories •Circuit Breaker Protection For Each Output •Voltage LED Displays •Amperage LED Displays •Unit Measures:8 3/4" x 14 3/4" x 11 1/8"