Answer:
A beacon from home to guide your way. It can be a lifesaver on a stormy day. What is it?
It is able to speak because it has a hard gone. You know what it is as soon as it has sung. What is it?
Above all things have I been placed Thus have I, a man disgraced. I describe sunlight or lock But after all, I'm just a rock
I have four legs but no tail. Usually I am heard only at night.
I can travel from there to here by disappearing, and here to there by reappearing.
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?