This is the Digitrax SoundFX V3 Motor & Function Series 7 Decoder for Kato HO AC4400 [SDXH187K1A].

• Fits Kato AC4400 or compatible HO locomotives
• Drop-in light board replacement
• 1.0 Amp/2 Amps Peak
• 8 FX3 Functions, 200ma Output
• 8 Ohm 28 mm round speaker w/330uF Capacitor