UT4D Duplex Equipped Utility Throttle Digitrax’ new Duplex Utility Throttle lets you Acquire and Dispatch locos without plugging in! UT4D is Infra-ready for use with UR90 IR Receiver Unit and UT4D is Duplex Radio-ready for use with UR92 Duplex Radio Transceiver Unit. The UT4 Series Utility Throttles are cost effective and simple to use. Let everyone visiting your layout run trains! Large knob for speed control and 3 position toggle switch for direction control and braking. 4 digit addressing. Use with any LocoNet System. Control Functions F0-F12-great for sound equipped locomotives.