SKU: 1487 A full featured, 4 function, 3.5" (88.9mm) harnessed decoder with a built in Keep-Alive (trademarked). The built-in KA2 Keep-Alive will keep your locomotive operating for 6-15 seconds without power (dirty track, bad contact, etc. etc.).

Included is our auto-adjusting BEMF for outstanding slow speed performance.

Also includes Quiet Drive for super quiet engine performance.

Dimensions: 0.945" x 0.66" x 0.33" or 33.4mm x 24mm x 8.38 mm