Retail Price: $49.00 OUR PRICE: $45.00The Keep-Alive™ (KA) devices are used to supply power to decoders during times of power interruption due to dirty track or problematic track work.KA3 will power an HO-Scale locomotive with headlights on for approximately 6 to 20 seconds (depending on the locomotive and it's motor, plus if the lights or sound is on will reduce the time)This Keep-Alive™ includes a blue and a black w/ white stripe wire with which to attach it to a decoder.Dimensions: 1.02” x .45” x .347” or 25.9mm x 11.43mm x 8.81mmScale: HO ScaleInput Rating: 12 to 16VSKU: 2000