3 Flash Warning for Model Radio Towers, Smokestacks, and Airplanes Nano / Red / 7-19 volt AC/DCOur 3 LED Sequence Circuit provides a great way of animating a scale model with a repeating sequence of lights. The lights flash 1,2,3 with a several second pause. Then repeat. We added our small but bright Nano size lights, each on 14" wire. Choose from Red or Cool White. You can run this circuit either on, 5 12 volt DC batteries or choose our 7 19 volt AC DC option for Model Train Power supplies.