This is the N Scale Drop In Kato F 16-Bit Sound Decoder by MRC. FEATURES: Synchronized diesel prime mover with random associated locomotive sounds 1.5 amp capacity Programmable for either 2-digit (1-127) or 4-digit (1-9999) addressesProgrammable start voltage and top voltage Programmable acceleration and deceleration rate Programmable 14, 28/ 128 speed steps Directional lighting, (FO). Sunny White LED included Programmable user selectable different horns and bells 28 accessory functions (F1-F28) Supports full read back of CV