Retail Price: $49.00 OUR PRICE: $45.00New DesignThe Keep-Alive™ (KA) devices are used to supply power to decoders during times of power interruption due to dirty track or problematic track work.  Newly-redesigned at half the size of a KA4, the KA2 will power HO or N scale locomotives with approximately one-third of the capacitance of KA3/KA4 devices (depending on the locomotive and motor).This Keep-Alive™ includes a blue and a black w/ white stripe wire with which to attach it to a decoder.  Dimensions: 0.35" x 0.35" x 0.61" or 8.9mm x 8.9mm x 15.5mmScale: HO Scale N ScaleInput Rating: 12 to 16VSKU: 1456