IIRC, On = On Solid, Slow = Slow Blink, Fast = Fast BlinkThanks. Using ARC XT I see 4 alert columns. One of these must control the blinking but it is not clear what each one does. Looks like Alert Pattern: On - Slow - Fast controls the blinking. Lacking description in the ARC documentation, Uniden documentation and the Easier to Read documentation. I must be slow.