Digitrax SDXN146K1E Sound & Control Decoder -- Fits Kato SD40-2 & Similar - 245-SDXN146K1EFits Kato N Scale SD40 2 and similar Locomotives Drop In Mobile Sound Decoders for Kato N scale Locomotives 1. 0 Amp 2 Amp Peak 4 FX3 Functions, 200ma output 8 Ohm 10 mm x 18 mm Oval Speaker 100uF Capacitor 8 Selectable Steam & Diesel Sound Schemes Included Series 6 Decoder Features Digitrax SoundFX Sound System Your locomotives will sound in scale like the real thing with SoundFX Customizable 16, 12 or 8 Bit Sound Works with SoundFX 8 and 16 Bit