Same great performance as the KA3 Keep-Alive™ in a tiny cube form factor.

Great for diesel installations that are tight on space, this little Keep-Alive™ fits nicely atop gear towers and slips right into many cabs.

• The Keep-Alive™ (KA) devices are used to supply power to decoders during times of power interruption due to dirty track or problematic track work.
• KA4 will power an HO-Scale locomotive with headlights on for approximately 6 to 20 seconds (depending on the locomotive and the efficiency of the motor).
• This Keep-Alive™ includes a blue and a black w/ white stripe wire with which to attach it to a decoder.
• Dimensions: .52” x .52” x .45” or 13.22mm x 13.22mm x 11.55mm