KA2 SKU: 1456 The Keep-Aliveä‹¢ (KA) devices are used to supply power to decoders during times of power interruption due to dirty track or problematic track work. KA2 will power an HO-Scale locomotive with headlights on for approximately 6 to 15 seconds (depending on the locomotive and the efficiency of the motor). This Keep-Aliveä‹¢ includes a blue and a black w/ white stripe wire with which to attach it to a decoder. Dimensions: 1.296" x .458" x .347" or 32.92mm x 11.63mm x 8.81mm Model: 1456 Shipping Weight: 0.01875lbs