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TRAIN CONTROL SYSTEMS N SCALE DECODER ASD4 4 FUNCTION DROP-IN... DECODER FEATURES: This full featured 4 Function BEMF Decoder fits the following Atlas N Scale Engines: GP7, GP9, GP9TT, GP15, GP30, and GP35. Included is Train Control Systems' auto-adjusting BEMF for outstanding slow speed performance and hassle free set-up. Also includes Quiet Drive for Super Quiet engine performance Back EMF Load Compensation For superior slow speed control even with heavy loads. Quiet Drive Creates SUPER QUIET engine performance. AutoDetect for realistic throttle response when using DC Power. Dimmed Brightness of bulbs or LEDs is adjustable Variable Momentum Lets you make custom acceleration curves. Mars, Gyra, and Rotary Beacon are adjustable. Decoder Lock For programming same address decoders independently. Function Remapping. 13 Buttons for most lights, 7 buttons for operations. Dimensions: 2.31" x .349" x .106" or 58.68 mm x 8.865 mm x 2.71 mm.